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The following changes since commit 518dac097ec305d76fab3f0f45ce785a3849d8b5:

  log: fix use-after-free (2014-07-02 13:36:34 -0600)

are available in the git repository at:

  git://git.kernel.dk/fio.git master

for you to fetch changes up to f302710c4b7dd09fa6beb61a983345b2eda2b8d4:

  iolog: fix bug when decompressing chunks with different sequence numbers (2014-07-03 21:57:29 -0600)

----------------------------------------------------------------
Jeff Moyer (1):
      fio.1 - escape the escape character so it shows up

Jens Axboe (16):
      Add support for runtime log compression
      tp: remove debug start/shutdown printfs
      Add support for storing compressed logs
      Move tp.[ch] to lib/
      configure: remove typo for zlib
      iolog: remove dead code that stored a gzip header
      glusterfs: fix leak in error path
      rbd: fix leak in error path
      iolog: do stat() after fopen()
      init: fix dead check for !td
      configure: add a note to install zlib-devel, if not there
      iolog: get rid of one section of CONFIG_ZLIB ifdef
      iolog: get rid of ic->nofree
      iolog: use a define instead of a raw bit mask
      flist: add flist_first_entry()
      iolog: fix bug when decompressing chunks with different sequence numbers

Tiziano Müller (2):
      Pass O_DIRECT/O_SYNC to glfs_open if requested.
      Bail out if glfs_creat failed

 HOWTO               |   20 +++
 Makefile            |    3 +-
 README              |    1 +
 backend.c           |   19 ++-
 cconv.c             |    4 +
 client.c            |    8 +-
 configure           |    4 +
 diskutil.c          |    4 +-
 engines/glusterfs.c |   25 +--
 engines/rbd.c       |    2 +
 fio.1               |   21 ++-
 fio.h               |    3 +
 flist.h             |   19 +++
 gclient.c           |    2 +-
 gfio.c              |    2 +-
 goptions.c          |    4 +-
 graph.c             |   12 +-
 init.c              |   98 ++++++++---
 io_u.c              |    2 +-
 iolog.c             |  450 ++++++++++++++++++++++++++++++++++++++++++++++++---
 iolog.h             |   52 +++++-
 lib/tp.c            |   99 ++++++++++++
 lib/tp.h            |   32 ++++
 options.c           |   22 +++
 server.c            |    8 +-
 stat.c              |   28 ++--
 thread_options.h    |    4 +
 trim.c              |    2 +-
 verify.c            |    4 +-
 29 files changed, 857 insertions(+), 97 deletions(-)
 create mode 100644 lib/tp.c
 create mode 100644 lib/tp.h

---

Diff of recent changes:

diff --git a/HOWTO b/HOWTO
index 3001fe7..fbc455d 100644
--- a/HOWTO
+++ b/HOWTO
@@ -1336,6 +1336,26 @@ log_avg_msec=int By default, fio will log an entry in the iops, latency,
 log_offset=int	If this is set, the iolog options will include the byte
 		offset for the IO entry as well as the other data values.
 
+log_compression=int	If this is set, fio will compress the IO logs as
+		it goes, to keep the memory footprint lower. When a log
+		reaches the specified size, that chunk is removed and
+		compressed in the background. Given that IO logs are
+		fairly highly compressible, this yields a nice memory
+		savings for longer runs. The downside is that the
+		compression will consume some background CPU cycles, so
+		it may impact the run. This, however, is also true if
+		the logging ends up consuming most of the system memory.
+		So pick your poison. The IO logs are saved normally at the
+		end of a run, by decompressing the chunks and storing them
+		in the specified log file. This feature depends on the
+		availability of zlib.
+
+log_store_compressed=bool	If set, and log_compression is also set,
+		fio will store the log files in a compressed format. They
+		can be decompressed with fio, using the --inflate-log
+		command line parameter. The files will be stored with a
+		.fz suffix.
+
 lockmem=int	Pin down the specified amount of memory with mlock(2). Can
 		potentially be used instead of removing memory or booting
 		with less memory to simulate a smaller amount of memory.
diff --git a/Makefile b/Makefile
index d49c8a4..65e95be 100644
--- a/Makefile
+++ b/Makefile
@@ -35,7 +35,8 @@ SOURCE := gettime.c ioengines.c init.c stat.c log.c time.c filesetup.c \
 		cconv.c lib/prio_tree.c json.c lib/zipf.c lib/axmap.c \
 		lib/lfsr.c gettime-thread.c helpers.c lib/flist_sort.c \
 		lib/hweight.c lib/getrusage.c idletime.c td_error.c \
-		profiles/tiobench.c profiles/act.c io_u_queue.c filelock.c
+		profiles/tiobench.c profiles/act.c io_u_queue.c filelock.c \
+		lib/tp.c
 
 ifdef CONFIG_64BIT_LLP64
   CFLAGS += -DBITS_PER_LONG=32
diff --git a/README b/README
index 1f72876..457b83d 100644
--- a/README
+++ b/README
@@ -176,6 +176,7 @@ $ fio
 	--idle-prof=option	Report cpu idleness on a system or percpu basis
 				(option=system,percpu) or run unit work
 				calibration only (option=calibrate).
+	--inflate-log=log	Inflate and output compressed log
 
 
 Any parameters following the options will be assumed to be job files,
diff --git a/backend.c b/backend.c
index 448fc59..68540ab 100644
--- a/backend.c
+++ b/backend.c
@@ -53,6 +53,7 @@
 #include "lib/getrusage.h"
 #include "idletime.h"
 #include "err.h"
+#include "lib/tp.h"
 
 static pthread_t disk_util_thread;
 static struct fio_mutex *disk_thread_mutex;
@@ -1443,6 +1444,9 @@ static void *thread_main(void *data)
 			goto err;
 	}
 
+	if (td->flags & TD_F_COMPRESS_LOG)
+		tp_init(&td->tp_data);
+
 	fio_verify_init(td);
 
 	fio_gettime(&td->epoch, NULL);
@@ -1524,6 +1528,9 @@ static void *thread_main(void *data)
 
 	fio_writeout_logs(td);
 
+	if (td->flags & TD_F_COMPRESS_LOG)
+		tp_exit(&td->tp_data);
+
 	if (o->exec_postrun)
 		exec_string(o, o->exec_postrun, (const char *)"postrun");
 
@@ -2020,9 +2027,13 @@ int fio_backend(void)
 		return 0;
 
 	if (write_bw_log) {
-		setup_log(&agg_io_log[DDIR_READ], 0, IO_LOG_TYPE_BW, 0, "agg-read_bw.log");
-		setup_log(&agg_io_log[DDIR_WRITE], 0, IO_LOG_TYPE_BW, 0, "agg-write_bw.log");
-		setup_log(&agg_io_log[DDIR_TRIM], 0, IO_LOG_TYPE_BW, 0, "agg-trim_bw.log");
+		struct log_params p = {
+			.log_type = IO_LOG_TYPE_BW,
+		};
+
+		setup_log(&agg_io_log[DDIR_READ], &p, "agg-read_bw.log");
+		setup_log(&agg_io_log[DDIR_WRITE], &p, "agg-write_bw.log");
+		setup_log(&agg_io_log[DDIR_TRIM], &p, "agg-trim_bw.log");
 	}
 
 	startup_mutex = fio_mutex_init(FIO_MUTEX_LOCKED);
@@ -2046,7 +2057,7 @@ int fio_backend(void)
 			for (i = 0; i < DDIR_RWDIR_CNT; i++) {
 				struct io_log *log = agg_io_log[i];
 
-				__finish_log(log);
+				flush_log(log);
 				free_log(log);
 			}
 		}
diff --git a/cconv.c b/cconv.c
index d253975..d4fb158 100644
--- a/cconv.c
+++ b/cconv.c
@@ -152,6 +152,8 @@ void convert_thread_options_to_cpu(struct thread_options *o,
 	o->use_os_rand = le32_to_cpu(top->use_os_rand);
 	o->log_avg_msec = le32_to_cpu(top->log_avg_msec);
 	o->log_offset = le32_to_cpu(top->log_offset);
+	o->log_gz = le32_to_cpu(top->log_gz);
+	o->log_gz_store = le32_to_cpu(top->log_gz_store);
 	o->norandommap = le32_to_cpu(top->norandommap);
 	o->softrandommap = le32_to_cpu(top->softrandommap);
 	o->bs_unaligned = le32_to_cpu(top->bs_unaligned);
@@ -323,6 +325,8 @@ void convert_thread_options_to_net(struct thread_options_pack *top,
 	top->use_os_rand = cpu_to_le32(o->use_os_rand);
 	top->log_avg_msec = cpu_to_le32(o->log_avg_msec);
 	top->log_offset = cpu_to_le32(o->log_offset);
+	top->log_gz = cpu_to_le32(o->log_gz);
+	top->log_gz_store = cpu_to_le32(o->log_gz_store);
 	top->norandommap = cpu_to_le32(o->norandommap);
 	top->softrandommap = cpu_to_le32(o->softrandommap);
 	top->bs_unaligned = cpu_to_le32(o->bs_unaligned);
diff --git a/client.c b/client.c
index e70a27d..1f52734 100644
--- a/client.c
+++ b/client.c
@@ -1237,10 +1237,10 @@ static struct cmd_iolog_pdu *convert_iolog(struct fio_net_cmd *cmd)
 		struct io_sample *s;
 
 		s = __get_sample(samples, ret->log_offset, i);
-		s->time	= le64_to_cpu(s->time);
-		s->val	= le64_to_cpu(s->val);
-		s->ddir	= le32_to_cpu(s->ddir);
-		s->bs	= le32_to_cpu(s->bs);
+		s->time		= le64_to_cpu(s->time);
+		s->val		= le64_to_cpu(s->val);
+		s->__ddir	= le32_to_cpu(s->__ddir);
+		s->bs		= le32_to_cpu(s->bs);
 
 		if (ret->log_offset) {
 			struct io_sample_offset *so = (void *) s;
diff --git a/configure b/configure
index f1e116e..1494dd7 100755
--- a/configure
+++ b/configure
@@ -1385,6 +1385,10 @@ if test "$gf_fadvise" = "yes" ; then
   output_sym "CONFIG_GF_FADVISE"
 fi
 
+if test "$zlib" = "no" ; then
+  echo "Consider installing zlib-dev (zlib-devel), some fio features depend on it."
+fi
+
 echo "LIBS+=$LIBS" >> $config_host_mak
 echo "CFLAGS+=$CFLAGS" >> $config_host_mak
 echo "CC=$cc" >> $config_host_mak
diff --git a/diskutil.c b/diskutil.c
index cb285cf..c5c5ea6 100644
--- a/diskutil.c
+++ b/diskutil.c
@@ -30,7 +30,7 @@ static void disk_util_free(struct disk_util *du)
 	while (!flist_empty(&du->slaves)) {
 		struct disk_util *slave;
 
-		slave = flist_entry(du->slaves.next, struct disk_util, slavelist);
+		slave = flist_first_entry(&du->slaves, struct disk_util, slavelist);
 		flist_del(&slave->slavelist);
 		slave->users--;
 	}
@@ -562,7 +562,7 @@ void disk_util_prune_entries(void)
 	while (!flist_empty(&disk_list)) {
 		struct disk_util *du;
 
-		du = flist_entry(disk_list.next, struct disk_util, list);
+		du = flist_first_entry(&disk_list, struct disk_util, list);
 		flist_del(&du->list);
 		disk_util_free(du);
 	}
diff --git a/engines/glusterfs.c b/engines/glusterfs.c
index b233b20..52006b0 100644
--- a/engines/glusterfs.c
+++ b/engines/glusterfs.c
@@ -77,16 +77,12 @@ int fio_gf_setup(struct thread_data *td)
 	}
 	dprint(FD_FILE, "fio setup %p\n", g->fs);
 	td->io_ops->data = g;
+	return 0;
 cleanup:
-	if (r) {
-		if (g) {
-			if (g->fs) {
-				glfs_fini(g->fs);
-			}
-			free(g);
-			td->io_ops->data = NULL;
-		}
-	}
+	if (g->fs)
+		glfs_fini(g->fs);
+	free(g);
+	td->io_ops->data = NULL;
 	return r;
 }
 
@@ -150,12 +146,19 @@ int fio_gf_open_file(struct thread_data *td, struct fio_file *f)
 		else
 			flags = O_RDONLY;
 	}
+
+	if (td->o.odirect)
+		flags |= OS_O_DIRECT;
+	if (td->o.sync_io)
+		flags |= O_SYNC;
+
 	dprint(FD_FILE, "fio file %s open mode %s td rw %s\n", f->file_name,
-	       flags == O_RDONLY ? "ro" : "rw", td_read(td) ? "read" : "write");
+	       flags & O_RDONLY ? "ro" : "rw", td_read(td) ? "read" : "write");
 	g->fd = glfs_creat(g->fs, f->file_name, flags, 0644);
 	if (!g->fd) {
-		log_err("glfs_creat failed.\n");
 		ret = errno;
+		log_err("glfs_creat failed.\n");
+		return ret;
 	}
 	/* file for read doesn't exist or shorter than required, create/extend it */
 	if (td_read(td)) {
diff --git a/engines/rbd.c b/engines/rbd.c
index 32ce60c..85a705f 100644
--- a/engines/rbd.c
+++ b/engines/rbd.c
@@ -86,6 +86,8 @@ static int _fio_setup_rbd_data(struct thread_data *td,
 	return 0;
 
 failed:
+	if (rbd_data)
+		free(rbd_data);
 	return 1;
 
 }
diff --git a/fio.1 b/fio.1
index da44e57..c58e817 100644
--- a/fio.1
+++ b/fio.1
@@ -182,8 +182,8 @@ set. On Windows, disk devices are accessed as \\.\PhysicalDrive0 for the first
 device, \\.\PhysicalDrive1 for the second etc. Note: Windows and FreeBSD
 prevent write access to areas of the disk containing in-use data
 (e.g. filesystems). If the wanted filename does need to include a colon, then
-escape that with a '\' character. For instance, if the filename is
-"/dev/dsk/foo@3,0:c", then you would use filename="/dev/dsk/foo@3,0\:c".
+escape that with a '\\' character. For instance, if the filename is
+"/dev/dsk/foo@3,0:c", then you would use filename="/dev/dsk/foo@3,0\\:c".
 .TP
 .BI filename_format \fR=\fPstr
 If sharing multiple files between jobs, it is usually necessary to have
@@ -1214,6 +1214,23 @@ Defaults to 0.
 If this is set, the iolog options will include the byte offset for the IO
 entry as well as the other data values.
 .TP
+.BI log_compression \fR=\fPint
+If this is set, fio will compress the IO logs as it goes, to keep the memory
+footprint lower. When a log reaches the specified size, that chunk is removed
+and compressed in the background. Given that IO logs are fairly highly
+compressible, this yields a nice memory savings for longer runs. The downside
+is that the compression will consume some background CPU cycles, so it may
+impact the run. This, however, is also true if the logging ends up consuming
+most of the system memory. So pick your poison. The IO logs are saved
+normally at the end of a run, by decompressing the chunks and storing them
+in the specified log file. This feature depends on the availability of zlib.
+.TP
+.BI log_store_compressed \fR=\fPbool
+If set, and \fBlog\fR_compression is also set, fio will store the log files in
+a compressed format. They can be decompressed with fio, using the
+\fB\-\-inflate-log\fR command line parameter. The files will be stored with a
+\fB\.fz\fR suffix.
+.TP
 .BI disable_lat \fR=\fPbool
 Disable measurements of total latency numbers. Useful only for cutting
 back the number of calls to \fBgettimeofday\fR\|(2), as that does impact performance at
diff --git a/fio.h b/fio.h
index 4d4af0a..df0d020 100644
--- a/fio.h
+++ b/fio.h
@@ -73,6 +73,7 @@ enum {
 	TD_F_PROFILE_OPS	= 64,
 	TD_F_COMPRESS		= 128,
 	TD_F_NOIO		= 256,
+	TD_F_COMPRESS_LOG	= 512,
 };
 
 enum {
@@ -112,6 +113,8 @@ struct thread_data {
 	struct io_log *bw_log;
 	struct io_log *iops_log;
 
+	struct tp_data *tp_data;
+
 	uint64_t stat_io_bytes[DDIR_RWDIR_CNT];
 	struct timeval bw_sample_time;
 
diff --git a/flist.h b/flist.h
index 8e13041..d453e79 100644
--- a/flist.h
+++ b/flist.h
@@ -140,6 +140,22 @@ static inline void flist_splice(const struct flist_head *list,
 		__flist_splice(list, head, head->next);
 }
 
+static inline void flist_splice_tail(struct flist_head *list,
+				     struct flist_head *head)
+{
+	if (!flist_empty(list))
+		__flist_splice(list, head->prev, head);
+}
+
+static inline void flist_splice_tail_init(struct flist_head *list,
+					  struct flist_head *head)
+{
+	if (!flist_empty(list)) {
+		__flist_splice(list, head->prev, head);
+		INIT_FLIST_HEAD(list);
+	}
+}
+
 static inline void flist_splice_init(struct flist_head *list,
 				    struct flist_head *head)
 {
@@ -158,6 +174,9 @@ static inline void flist_splice_init(struct flist_head *list,
 #define flist_entry(ptr, type, member) \
 	container_of(ptr, type, member)
 
+#define flist_first_entry(ptr, type, member) \
+	flist_entry((ptr)->next, type, member)
+
 /**
  * flist_for_each	-	iterate over a list
  * @pos:	the &struct flist_head to use as a loop counter.
diff --git a/gclient.c b/gclient.c
index d236f86..42bc761 100644
--- a/gclient.c
+++ b/gclient.c
@@ -694,7 +694,7 @@ static void gfio_client_job_start(struct fio_client *client, struct fio_net_cmd
 
 static void gfio_client_iolog(struct fio_client *client, struct cmd_iolog_pdu *pdu)
 {
-	printf("got iolog: name=%s, type=%u, entries=%u\n", pdu->name, pdu->log_type, pdu->nr_samples);
+	printf("got iolog: name=%s, type=%u, entries=%lu\n", pdu->name, pdu->log_type, (unsigned long) pdu->nr_samples);
 	free(pdu);
 }
 
diff --git a/gfio.c b/gfio.c
index 65302e6..37c1db6 100644
--- a/gfio.c
+++ b/gfio.c
@@ -444,7 +444,7 @@ static int send_job_file(struct gui_entry *ge)
 	while (!flist_empty(&gc->o_list)) {
 		struct gfio_client_options *gco;
 
-		gco = flist_entry(gc->o_list.next, struct gfio_client_options, list);
+		gco = flist_first_entry(&gc->o_list, struct gfio_client_options, list);
 		flist_del(&gco->list);
 		free(gco);
 	}
diff --git a/goptions.c b/goptions.c
index 5b5c89e..c01b6cc 100644
--- a/goptions.c
+++ b/goptions.c
@@ -1433,7 +1433,7 @@ static int gopt_handle_changed_options(struct gopt_job_view *gjv)
 		goto done;
 
 	while (!flist_empty(&gjv->changed_list)) {
-		gopt = flist_entry(gjv->changed_list.next, struct gopt, changed_list);
+		gopt = flist_first_entry(&gjv->changed_list, struct gopt, changed_list);
 		flist_del_init(&gopt->changed_list);
 	}
 
@@ -1577,7 +1577,7 @@ void gopt_get_options_window(GtkWidget *window, struct gfio_client *gc)
 
 	gjv = calloc(1, sizeof(*gjv));
 	INIT_FLIST_HEAD(&gjv->changed_list);
-	gco = flist_entry(gc->o_list.next, struct gfio_client_options, list);
+	gco = flist_first_entry(&gc->o_list, struct gfio_client_options, list);
 	gjv->o = &gco->o;
 	gjv->dialog = dialog;
 	gjv->client = gc;
diff --git a/graph.c b/graph.c
index 5c865dc..c45954c 100644
--- a/graph.c
+++ b/graph.c
@@ -687,7 +687,7 @@ static void graph_value_drop(struct graph_label *l, struct graph_value *v)
 	 */
 	while (!(v->flags & GV_F_ON_PRIO)) {
 		assert(!flist_empty(&v->alias));
-		v = flist_entry(v->alias.next, struct graph_value, alias);
+		v = flist_first_entry(&v->alias, struct graph_value, alias);
 	}
 
 	prio_tree_remove(&l->prio_tree, &v->node);
@@ -698,7 +698,7 @@ static void graph_value_drop(struct graph_label *l, struct graph_value *v)
 	while (!flist_empty(&v->alias)) {
 		struct graph_value *a;
 
-		a = flist_entry(v->alias.next, struct graph_value, alias);
+		a = flist_first_entry(&v->alias, struct graph_value, alias);
 		flist_del_init(&a->alias);
 
 		__graph_value_drop(l, a);
@@ -773,7 +773,7 @@ static void graph_label_add_value(struct graph_label *i, void *value,
 			to_drop = 2;
 
 		while (to_drop-- && !flist_empty(&i->value_list)) {
-			x = flist_entry(i->value_list.next, struct graph_value, list);
+			x = flist_first_entry(&i->value_list, struct graph_value, list);
 			graph_value_drop(i, x);
 
 			/*
@@ -836,7 +836,7 @@ static void graph_free_values(struct graph_label *l)
 	struct graph_value *i;
 
 	while (!flist_empty(&l->value_list)) {
-		i = flist_entry(l->value_list.next, struct graph_value, list);
+		i = flist_first_entry(&l->value_list, struct graph_value, list);
 		graph_value_drop(l, i);
 	}
 }
@@ -846,7 +846,7 @@ static void graph_free_labels(struct graph *g)
 	struct graph_label *i;
 
 	while (!flist_empty(&g->label_list)) {
-		i = flist_entry(g->label_list.next, struct graph_label, list);
+		i = flist_first_entry(&g->label_list, struct graph_label, list);
 		flist_del(&i->list);
 		graph_free_values(i);
 		free(i);
@@ -1010,7 +1010,7 @@ const char *graph_find_tooltip(struct graph *g, int ix, int iy)
 					}
 				}
 				if (!flist_empty(&v->alias))
-					v = flist_entry(v->alias.next, struct graph_value, alias);
+					v = flist_first_entry(&v->alias, struct graph_value, alias);
 			} while (v != rootv);
 		} while ((n = prio_tree_next(&iter)) != NULL);
 
diff --git a/init.c b/init.c
index c2d6109..8268ed5 100644
--- a/init.c
+++ b/init.c
@@ -170,6 +170,13 @@ static struct option l_opts[FIO_NR_OPTIONS] = {
 		.has_arg	= required_argument,
 		.val		= 'x' | FIO_CLIENT_FLAG,
 	},
+#ifdef CONFIG_ZLIB
+	{
+		.name		= (char *) "inflate-log",
+		.has_arg	= required_argument,
+		.val		= 'X' | FIO_CLIENT_FLAG,
+	},
+#endif
 	{
 		.name		= (char *) "alloc-size",
 		.has_arg	= required_argument,
@@ -1145,25 +1152,70 @@ static int add_job(struct thread_data *td, const char *jobname, int job_add_num,
 		goto err;
 
 	if (o->lat_log_file) {
-		snprintf(logname, sizeof(logname), "%s_lat.log", o->lat_log_file);
-		setup_log(&td->lat_log, o->log_avg_msec, IO_LOG_TYPE_LAT,
-				o->log_offset, logname);
-		snprintf(logname, sizeof(logname), "%s_slat.log", o->lat_log_file);
-		setup_log(&td->slat_log, o->log_avg_msec, IO_LOG_TYPE_SLAT,
-				o->log_offset, logname);
-		snprintf(logname, sizeof(logname), "%s_clat.log", o->lat_log_file);
-		setup_log(&td->clat_log, o->log_avg_msec, IO_LOG_TYPE_CLAT,
-				o->log_offset, logname);
+		struct log_params p = {
+			.td = td,
+			.avg_msec = o->log_avg_msec,
+			.log_type = IO_LOG_TYPE_LAT,
+			.log_offset = o->log_offset,
+			.log_gz = o->log_gz,
+			.log_gz_store = o->log_gz_store,
+		};
+		const char *suf;
+
+		if (p.log_gz_store)
+			suf = "log.fz";
+		else
+			suf = "log";
+
+		snprintf(logname, sizeof(logname), "%s_lat.%s",
+				o->lat_log_file, suf);
+		setup_log(&td->lat_log, &p, logname);
+		snprintf(logname, sizeof(logname), "%s_slat.%s",
+				o->lat_log_file, suf);
+		setup_log(&td->slat_log, &p, logname);
+		snprintf(logname, sizeof(logname), "%s_clat.%s",
+				o->lat_log_file, suf);
+		setup_log(&td->clat_log, &p, logname);
 	}
 	if (o->bw_log_file) {
-		snprintf(logname, sizeof(logname), "%s_bw.log", o->bw_log_file);
-		setup_log(&td->bw_log, o->log_avg_msec, IO_LOG_TYPE_BW,
-				o->log_offset, logname);
+		struct log_params p = {
+			.td = td,
+			.avg_msec = o->log_avg_msec,
+			.log_type = IO_LOG_TYPE_BW,
+			.log_offset = o->log_offset,
+			.log_gz = o->log_gz,
+			.log_gz_store = o->log_gz_store,
+		};
+		const char *suf;
+
+		if (p.log_gz_store)
+			suf = "log.fz";
+		else
+			suf = "log";
+
+		snprintf(logname, sizeof(logname), "%s_bw.%s",
+				o->bw_log_file, suf);
+		setup_log(&td->bw_log, &p, logname);
 	}
 	if (o->iops_log_file) {
-		snprintf(logname, sizeof(logname), "%s_iops.log", o->iops_log_file);
-		setup_log(&td->iops_log, o->log_avg_msec, IO_LOG_TYPE_IOPS,
-				o->log_offset, logname);
+		struct log_params p = {
+			.td = td,
+			.avg_msec = o->log_avg_msec,
+			.log_type = IO_LOG_TYPE_IOPS,
+			.log_offset = o->log_offset,
+			.log_gz = o->log_gz,
+			.log_gz_store = o->log_gz_store,
+		};
+		const char *suf;
+
+		if (p.log_gz_store)
+			suf = "log.fz";
+		else
+			suf = "log";
+
+		snprintf(logname, sizeof(logname), "%s_iops.%s",
+				o->iops_log_file, suf);
+		setup_log(&td->iops_log, &p, logname);
 	}
 
 	if (!o->name)
@@ -1555,6 +1607,9 @@ static void usage(const char *name)
 	printf("  --idle-prof=option\tReport cpu idleness on a system or percpu basis\n"
 		"\t\t\t(option=system,percpu) or run unit work\n"
 		"\t\t\tcalibration only (option=calibrate)\n");
+#ifdef CONFIG_ZLIB
+	printf("  --inflate-log=log\tInflate and output compressed log\n");
+#endif
 	printf("\nFio was written by Jens Axboe <jens.axboe@xxxxxxxxxx>");
 	printf("\n                   Jens Axboe <jaxboe@xxxxxxxxxxxx>");
 	printf("\n                   Jens Axboe <axboe@xxxxxx>\n");
@@ -1886,6 +1941,13 @@ int parse_cmd_line(int argc, char *argv[], int client_type)
 			nr_job_sections++;
 			break;
 			}
+#ifdef CONFIG_ZLIB
+		case 'X':
+			exit_val = iolog_file_inflate(optarg);
+			did_arg++;
+			do_exit++;
+			break;
+#endif
 		case 'p':
 			did_arg = 1;
 			if (exec_profile)
@@ -1943,10 +2005,8 @@ int parse_cmd_line(int argc, char *argv[], int client_type)
 			if (!ret && !strcmp(opt, "ioengine")) {
 				free_ioengine(td);
 				if (ioengine_load(td)) {
-					if (td) {
-						put_job(td);
-						td = NULL;
-					}
+					put_job(td);
+					td = NULL;
 					do_exit++;
 					break;
 				}
diff --git a/io_u.c b/io_u.c
index 5b9d483..16b52d6 100644
--- a/io_u.c
+++ b/io_u.c
@@ -223,7 +223,7 @@ static int get_next_rand_offset(struct thread_data *td, struct fio_file *f,
 	if (!flist_empty(&td->next_rand_list)) {
 		struct rand_off *r;
 fetch:
-		r = flist_entry(td->next_rand_list.next, struct rand_off, list);
+		r = flist_first_entry(&td->next_rand_list, struct rand_off, list);
 		flist_del(&r->list);
 		*b = r->off;
 		free(r);
diff --git a/iolog.c b/iolog.c
index 96afec6..29997ce 100644
--- a/iolog.c
+++ b/iolog.c
@@ -6,11 +6,19 @@
 #include <stdlib.h>
 #include <libgen.h>
 #include <assert.h>
+#include <sys/types.h>
+#include <sys/stat.h>
+#include <unistd.h>
+#ifdef CONFIG_ZLIB
+#include <zlib.h>
+#endif
+
 #include "flist.h"
 #include "fio.h"
 #include "verify.h"
 #include "trim.h"
 #include "filelock.h"
+#include "lib/tp.h"
 
 static const char iolog_ver2[] = "fio version 2 iolog";
 
@@ -123,7 +131,7 @@ int read_iolog_get(struct thread_data *td, struct io_u *io_u)
 	while (!flist_empty(&td->io_log_list)) {
 		int ret;
 
-		ipo = flist_entry(td->io_log_list.next, struct io_piece, list);
+		ipo = flist_first_entry(&td->io_log_list, struct io_piece, list);
 		flist_del(&ipo->list);
 		remove_trim_entry(td, ipo);
 
@@ -176,7 +184,7 @@ void prune_io_piece_log(struct thread_data *td)
 	}
 
 	while (!flist_empty(&td->io_hist_list)) {
-		ipo = flist_entry(td->io_hist_list.next, struct io_piece, list);
+		ipo = flist_entry(&td->io_hist_list, struct io_piece, list);
 		flist_del(&ipo->list);
 		remove_trim_entry(td, ipo);
 		td->io_hist_len--;
@@ -539,19 +547,35 @@ int init_iolog(struct thread_data *td)
 	return ret;
 }
 
-void setup_log(struct io_log **log, unsigned long avg_msec, int log_type,
-	       int log_offset, const char *filename)
+void setup_log(struct io_log **log, struct log_params *p,
+	       const char *filename)
 {
 	struct io_log *l = malloc(sizeof(*l));
 
 	memset(l, 0, sizeof(*l));
 	l->nr_samples = 0;
 	l->max_samples = 1024;
-	l->log_type = log_type;
-	l->log_offset = log_offset;
+	l->log_type = p->log_type;
+	l->log_offset = p->log_offset;
+	l->log_gz = p->log_gz;
+	l->log_gz_store = p->log_gz_store;
 	l->log = malloc(l->max_samples * log_entry_sz(l));
-	l->avg_msec = avg_msec;
+	l->avg_msec = p->avg_msec;
 	l->filename = strdup(filename);
+	l->td = p->td;
+
+	if (l->log_offset)
+		l->log_ddir_mask = LOG_OFFSET_SAMPLE_BIT;
+
+	INIT_FLIST_HEAD(&l->chunk_list);
+
+	if (l->log_gz && !p->td)
+		l->log_gz = 0;
+	else if (l->log_gz) {
+		pthread_mutex_init(&l->chunk_lock, NULL);
+		p->td->flags |= TD_F_COMPRESS_LOG;
+	}
+
 	*log = l;
 }
 
@@ -588,38 +612,276 @@ void free_log(struct io_log *log)
 	free(log);
 }
 
-void __finish_log(struct io_log *log)
+static void flush_samples(FILE *f, void *samples, uint64_t sample_size)
 {
-	uint64_t i;
-	void *buf;
-	FILE *f;
+	struct io_sample *s;
+	int log_offset;
+	uint64_t i, nr_samples;
 
-	f = fopen(log->filename, "a");
-	if (!f) {
-		perror("fopen log");
+	if (!sample_size)
 		return;
-	}
 
-	buf = set_file_buffer(f);
+	s = __get_sample(samples, 0, 0);
+	log_offset = (s->__ddir & LOG_OFFSET_SAMPLE_BIT) != 0;
+
+	nr_samples = sample_size / __log_entry_sz(log_offset);
 
-	for (i = 0; i < log->nr_samples; i++) {
-		struct io_sample *s = get_sample(log, i);
+	for (i = 0; i < nr_samples; i++) {
+		s = __get_sample(samples, log_offset, i);
 
-		if (!log->log_offset) {
+		if (!log_offset) {
 			fprintf(f, "%lu, %lu, %u, %u\n",
 					(unsigned long) s->time,
 					(unsigned long) s->val,
-					s->ddir, s->bs);
+					io_sample_ddir(s), s->bs);
 		} else {
 			struct io_sample_offset *so = (void *) s;
 
 			fprintf(f, "%lu, %lu, %u, %u, %llu\n",
 					(unsigned long) s->time,
 					(unsigned long) s->val,
-					s->ddir, s->bs,
+					io_sample_ddir(s), s->bs,
 					(unsigned long long) so->offset);
 		}
 	}
+}
+
+#ifdef CONFIG_ZLIB
+
+struct iolog_flush_data {
+	struct tp_work work;
+	struct io_log *log;
+	void *samples;
+	uint64_t nr_samples;
+};
+
+struct iolog_compress {
+	struct flist_head list;
+	void *buf;
+	size_t len;
+	unsigned int seq;
+};
+
+#define GZ_CHUNK	131072
+
+static struct iolog_compress *get_new_chunk(unsigned int seq)
+{
+	struct iolog_compress *c;
+
+	c = malloc(sizeof(*c));
+	INIT_FLIST_HEAD(&c->list);
+	c->buf = malloc(GZ_CHUNK);
+	c->len = 0;
+	c->seq = seq;
+	return c;
+}
+
+static void free_chunk(struct iolog_compress *ic)
+{
+	free(ic->buf);
+	free(ic);
+}
+
+static int z_stream_init(z_stream *stream, int gz_hdr)
+{
+	int wbits = 15;
+
+	stream->zalloc = Z_NULL;
+	stream->zfree = Z_NULL;
+	stream->opaque = Z_NULL;
+	stream->next_in = Z_NULL;
+
+	if (gz_hdr)
+		wbits += 32;
+
+	if (inflateInit2(stream, wbits) != Z_OK)
+		return 1;
+
+	return 0;
+}
+
+struct flush_chunk_iter {
+	unsigned int seq;
+	void *buf;
+	size_t buf_size;
+	size_t buf_used;
+	size_t chunk_sz;
+};
+
+static void finish_chunk(z_stream *stream, FILE *f,
+			 struct flush_chunk_iter *iter)
+{
+	int ret;
+
+	ret = inflateEnd(stream);
+	if (ret != Z_OK)
+		log_err("fio: failed to end log inflation (%d)\n", ret);
+
+	flush_samples(f, iter->buf, iter->buf_used);
+	free(iter->buf);
+	iter->buf = NULL;
+	iter->buf_size = iter->buf_used = 0;
+}
+
+static size_t flush_chunk(struct iolog_compress *ic, int gz_hdr, FILE *f,
+			  z_stream *stream, struct flush_chunk_iter *iter)
+{
+	if (ic->seq != iter->seq) {
+		if (iter->seq)
+			finish_chunk(stream, f, iter);
+
+		z_stream_init(stream, gz_hdr);
+		iter->seq = ic->seq;
+	}
+
+	stream->avail_in = ic->len;
+	stream->next_in = ic->buf;
+
+	if (!iter->buf_size) {
+		iter->buf_size = iter->chunk_sz;
+		iter->buf = malloc(iter->buf_size);
+	}
+
+	while (stream->avail_in) {
+		size_t this_out = iter->buf_size - iter->buf_used;
+		int err;
+
+		stream->avail_out = this_out;
+		stream->next_out = iter->buf + iter->buf_used;
+
+		err = inflate(stream, Z_NO_FLUSH);
+		if (err < 0) {
+			log_err("fio: failed inflating log: %d\n", err);
+			break;
+		}
+
+		iter->buf_used += this_out - stream->avail_out;
+
+		if (!stream->avail_out) {
+			iter->buf_size += iter->chunk_sz;
+			iter->buf = realloc(iter->buf, iter->buf_size);
+			continue;
+		}
+
+		if (err == Z_STREAM_END)
+			break;
+	}
+
+	return (void *) stream->next_in - ic->buf;
+}
+
+static void flush_gz_chunks(struct io_log *log, FILE *f)
+{
+	struct flush_chunk_iter iter = { .chunk_sz = log->log_gz, };
+	z_stream stream;
+
+	while (!flist_empty(&log->chunk_list)) {
+		struct iolog_compress *ic;
+
+		ic = flist_first_entry(&log->chunk_list, struct iolog_compress, list);
+		flist_del(&ic->list);
+
+		if (log->log_gz_store)
+			fwrite(ic->buf, ic->len, 1, f);
+		else
+			flush_chunk(ic, log->log_gz_store, f, &stream, &iter);
+
+		free_chunk(ic);
+	}
+
+	if (iter.seq) {
+		finish_chunk(&stream, f, &iter);
+		free(iter.buf);
+	}
+}
+
+int iolog_file_inflate(const char *file)
+{
+	struct flush_chunk_iter iter = { .chunk_sz = 64 * 1024 * 1024, };
+	struct iolog_compress ic;
+	z_stream stream;
+	struct stat sb;
+	ssize_t ret;
+	size_t total;
+	void *buf;
+	FILE *f;
+
+	f = fopen(file, "r");
+	if (!f) {
+		perror("fopen");
+		return 1;
+	}
+
+	if (stat(file, &sb) < 0) {
+		fclose(f);
+		perror("stat");
+		return 1;
+	}
+
+	ic.buf = buf = malloc(sb.st_size);
+	ic.len = sb.st_size;
+	ic.seq = 1;
+
+	ret = fread(ic.buf, ic.len, 1, f);
+	if (ret < 0) {
+		perror("fread");
+		fclose(f);
+		return 1;
+	} else if (ret != 1) {
+		log_err("fio: short read on reading log\n");
+		fclose(f);
+		return 1;
+	}
+
+	fclose(f);
+
+	total = ic.len;
+	do {
+		size_t ret;
+
+		ret = flush_chunk(&ic,  1, stdout, &stream, &iter);
+		total -= ret;
+		if (!total)
+			break;
+
+		ic.seq++;
+		ic.len -= ret;
+		ic.buf += ret;
+	} while (1);
+
+	if (iter.seq) {
+		finish_chunk(&stream, stdout, &iter);
+		free(iter.buf);
+	}
+
+	free(buf);
+	return 0;
+}
+
+#else
+
+static void flush_gz_chunks(struct io_log *log, FILE *f)
+{
+}
+
+#endif
+
+void flush_log(struct io_log *log)
+{
+	void *buf;
+	FILE *f;
+
+	f = fopen(log->filename, "w");
+	if (!f) {
+		perror("fopen log");
+		return;
+	}
+
+	buf = set_file_buffer(f);
+
+	flush_gz_chunks(log, f);
+
+	flush_samples(f, log->log, log->nr_samples * log_entry_sz(log));
 
 	fclose(f);
 	clear_file_buffer(buf);
@@ -627,22 +889,162 @@ void __finish_log(struct io_log *log)
 
 static int finish_log(struct thread_data *td, struct io_log *log, int trylock)
 {
+	if (td->tp_data)
+		iolog_flush(log, 1);
+
 	if (trylock) {
 		if (fio_trylock_file(log->filename))
 			return 1;
 	} else
 		fio_lock_file(log->filename);
 
-	if (td->client_type == FIO_CLIENT_TYPE_GUI) {
+	if (td->client_type == FIO_CLIENT_TYPE_GUI)
 		fio_send_iolog(td, log, log->filename);
-	} else
-		__finish_log(log);
+	else
+		flush_log(log);
 
 	fio_unlock_file(log->filename);
 	free_log(log);
 	return 0;
 }
 
+#ifdef CONFIG_ZLIB
+
+static int gz_work(struct tp_work *work)
+{
+	struct iolog_flush_data *data;
+	struct iolog_compress *c;
+	struct flist_head list;
+	unsigned int seq;
+	z_stream stream;
+	size_t total = 0;
+	int ret;
+
+	INIT_FLIST_HEAD(&list);
+
+	data = container_of(work, struct iolog_flush_data, work);
+
+	stream.zalloc = Z_NULL;
+	stream.zfree = Z_NULL;
+	stream.opaque = Z_NULL;
+
+	ret = deflateInit(&stream, Z_DEFAULT_COMPRESSION);
+	if (ret != Z_OK) {
+		log_err("fio: failed to init gz stream\n");
+		return 0;
+	}
+
+	seq = ++data->log->chunk_seq;
+
+	stream.next_in = (void *) data->samples;
+	stream.avail_in = data->nr_samples * log_entry_sz(data->log);
+
+	do {
+		c = get_new_chunk(seq);
+		stream.avail_out = GZ_CHUNK;
+		stream.next_out = c->buf;
+		ret = deflate(&stream, Z_NO_FLUSH);
+		if (ret < 0) {
+			log_err("fio: deflate log (%d)\n", ret);
+			break;
+		}
+
+		c->len = GZ_CHUNK - stream.avail_out;
+		flist_add_tail(&c->list, &list);
+		total += c->len;
+	} while (stream.avail_in);
+
+	stream.next_out = c->buf + c->len;
+	stream.avail_out = GZ_CHUNK - c->len;
+
+	ret = deflate(&stream, Z_FINISH);
+	if (ret == Z_STREAM_END)
+		c->len = GZ_CHUNK - stream.avail_out;
+	else {
+		do {
+			c = get_new_chunk(seq);
+			stream.avail_out = GZ_CHUNK;
+			stream.next_out = c->buf;
+			ret = deflate(&stream, Z_FINISH);
+			c->len = GZ_CHUNK - stream.avail_out;
+			flist_add_tail(&c->list, &list);
+		} while (ret != Z_STREAM_END);
+	}
+
+	ret = deflateEnd(&stream);
+	if (ret != Z_OK)
+		log_err("fio: deflateEnd %d\n", ret);
+
+	free(data->samples);
+
+	if (!flist_empty(&list)) {
+		pthread_mutex_lock(&data->log->chunk_lock);
+		flist_splice_tail(&list, &data->log->chunk_list);
+		pthread_mutex_unlock(&data->log->chunk_lock);
+	}
+
+	if (work->wait) {
+		work->done = 1;
+		pthread_cond_signal(&work->cv);
+	} else
+		free(data);
+
+	return 0;
+}
+
+int iolog_flush(struct io_log *log, int wait)
+{
+	struct tp_data *tdat = log->td->tp_data;
+	struct iolog_flush_data *data;
+	size_t sample_size;
+
+	data = malloc(sizeof(*data));
+	if (!data)
+		return 1;
+
+	data->log = log;
+
+	sample_size = log->nr_samples * log_entry_sz(log);
+	data->samples = malloc(sample_size);
+	if (!data->samples) {
+		free(data);
+		return 1;
+	}
+
+	memcpy(data->samples, log->log, sample_size);
+	data->nr_samples = log->nr_samples;
+	data->work.fn = gz_work;
+	log->nr_samples = 0;
+
+	if (wait) {
+		pthread_mutex_init(&data->work.lock, NULL);
+		pthread_cond_init(&data->work.cv, NULL);
+		data->work.wait = 1;
+	} else
+		data->work.wait = 0;
+
+	tp_queue_work(tdat, &data->work);
+
+	if (wait) {
+		pthread_mutex_lock(&data->work.lock);
+		while (!data->work.done)
+			pthread_cond_wait(&data->work.cv, &data->work.lock);
+		pthread_mutex_unlock(&data->work.lock);
+		free(data);
+	}
+
+	return 0;
+}
+
+#else
+
+int iolog_flush(struct io_log *log, int wait)
+{
+	return 1;
+}
+
+#endif
+
 static int write_iops_log(struct thread_data *td, int try)
 {
 	struct io_log *log = td->iops_log;
diff --git a/iolog.h b/iolog.h
index f97d91f..fcd6794 100644
--- a/iolog.h
+++ b/iolog.h
@@ -24,7 +24,7 @@ struct io_stat {
 struct io_sample {
 	uint64_t time;
 	uint64_t val;
-	uint32_t ddir;
+	uint32_t __ddir;
 	uint32_t bs;
 };
 
@@ -52,8 +52,12 @@ struct io_log {
 	uint64_t max_samples;
 	void *log;
 
+	unsigned int log_ddir_mask;
+
 	char *filename;
 
+	struct thread_data *td;
+
 	unsigned int log_type;
 
 	/*
@@ -67,14 +71,41 @@ struct io_log {
 	unsigned int log_offset;
 
 	/*
+	 * Max size of log entries before a chunk is compressed
+	 */
+	unsigned int log_gz;
+
+	/*
+	 * Don't deflate for storing, just store the compressed bits
+	 */
+	unsigned int log_gz_store;
+
+	/*
 	 * Windowed average, for logging single entries average over some
 	 * period of time.
 	 */
 	struct io_stat avg_window[DDIR_RWDIR_CNT];
 	unsigned long avg_msec;
 	unsigned long avg_last;
+
+	pthread_mutex_t chunk_lock;
+	unsigned int chunk_seq;
+	struct flist_head chunk_list;
 };
 
+/*
+ * If the upper bit is set, then we have the offset as well
+ */
+#define LOG_OFFSET_SAMPLE_BIT	0x80000000U
+#define io_sample_ddir(io)	((io)->__ddir & ~LOG_OFFSET_SAMPLE_BIT)
+
+static inline void io_sample_set_ddir(struct io_log *log,
+				      struct io_sample *io,
+				      enum fio_ddir ddir)
+{
+	io->__ddir = ddir | log->log_ddir_mask;
+}
+
 static inline size_t __log_entry_sz(int log_offset)
 {
 	if (log_offset)
@@ -153,9 +184,23 @@ extern void queue_io_piece(struct thread_data *, struct io_piece *);
 extern void prune_io_piece_log(struct thread_data *);
 extern void write_iolog_close(struct thread_data *);
 
+#ifdef CONFIG_ZLIB
+extern int iolog_file_inflate(const char *);
+#endif
+
 /*
  * Logging
  */
+struct log_params {
+	struct thread_data *td;
+	unsigned long avg_msec;
+	int log_type;
+	int log_offset;
+	int log_gz;
+	int log_gz_store;
+	int log_compress;
+};
+
 extern void finalize_logs(struct thread_data *td);
 extern void add_lat_sample(struct thread_data *, enum fio_ddir, unsigned long,
 				unsigned int, uint64_t);
@@ -169,13 +214,14 @@ extern void add_iops_sample(struct thread_data *, enum fio_ddir, unsigned int,
 				struct timeval *);
 extern void init_disk_util(struct thread_data *);
 extern void update_rusage_stat(struct thread_data *);
-extern void setup_log(struct io_log **, unsigned long, int, int, const char *);
-extern void __finish_log(struct io_log *);
+extern void setup_log(struct io_log **, struct log_params *, const char *);
+extern void flush_log(struct io_log *);
 extern void free_log(struct io_log *);
 extern struct io_log *agg_io_log[DDIR_RWDIR_CNT];
 extern int write_bw_log;
 extern void add_agg_sample(unsigned long, enum fio_ddir, unsigned int);
 extern void fio_writeout_logs(struct thread_data *);
+extern int iolog_flush(struct io_log *, int);
 
 static inline void init_ipo(struct io_piece *ipo)
 {
diff --git a/lib/tp.c b/lib/tp.c
new file mode 100644
index 0000000..5111910
--- /dev/null
+++ b/lib/tp.c
@@ -0,0 +1,99 @@
+#include <stdio.h>
+#include <stdlib.h>
+#include <stdarg.h>
+#include <unistd.h>
+#include <errno.h>
+#include <pthread.h>
+
+#include "../smalloc.h"
+#include "../log.h"
+#include "tp.h"
+
+static void tp_flush_work(struct flist_head *list)
+{
+	struct tp_work *work;
+
+	while (!flist_empty(list)) {
+		work = flist_entry(list->next, struct tp_work, list);
+		flist_del(&work->list);
+		work->fn(work);
+	}
+}
+
+static void *tp_thread(void *data)
+{
+	struct tp_data *tdat = data;
+	struct flist_head work_list;
+
+	INIT_FLIST_HEAD(&work_list);
+
+	while (1) {
+		pthread_mutex_lock(&tdat->lock);
+
+		if (!tdat->thread_exit && flist_empty(&tdat->work))
+			pthread_cond_wait(&tdat->cv, &tdat->lock);
+
+		if (!flist_empty(&tdat->work))
+			flist_splice_tail_init(&tdat->work, &work_list);
+
+		pthread_mutex_unlock(&tdat->lock);
+
+		if (flist_empty(&work_list)) {
+			if (tdat->thread_exit)
+				break;
+			continue;
+		}
+
+		tp_flush_work(&work_list);
+	}
+
+	return NULL;
+}
+
+void tp_queue_work(struct tp_data *tdat, struct tp_work *work)
+{
+	work->done = 0;
+
+	pthread_mutex_lock(&tdat->lock);
+	flist_add_tail(&work->list, &tdat->work);
+	pthread_cond_signal(&tdat->cv);
+	pthread_mutex_unlock(&tdat->lock);
+}
+
+void tp_init(struct tp_data **tdatp)
+{
+	struct tp_data *tdat;
+	int ret;
+
+	if (*tdatp)
+		return;
+
+	*tdatp = tdat = smalloc(sizeof(*tdat));
+	pthread_mutex_init(&tdat->lock, NULL);
+	INIT_FLIST_HEAD(&tdat->work);
+	pthread_cond_init(&tdat->cv, NULL);
+	pthread_cond_init(&tdat->sleep_cv, NULL);
+
+	ret = pthread_create(&tdat->thread, NULL, tp_thread, tdat);
+	if (ret)
+		log_err("fio: failed to create tp thread\n");
+}
+
+void tp_exit(struct tp_data **tdatp)
+{
+	struct tp_data *tdat = *tdatp;
+	void *ret;
+
+	if (!tdat)
+		return;
+
+	tdat->thread_exit = 1;
+	pthread_mutex_lock(&tdat->lock);
+	pthread_cond_signal(&tdat->cv);
+	pthread_mutex_unlock(&tdat->lock);
+
+	pthread_join(tdat->thread, &ret);
+
+	sfree(tdat);
+	*tdatp = NULL;
+}
diff --git a/lib/tp.h b/lib/tp.h
new file mode 100644
index 0000000..5b07cc6
--- /dev/null
+++ b/lib/tp.h
@@ -0,0 +1,32 @@
+#ifndef FIO_TP_H
+#define FIO_TP_H
+
+#include "../flist.h"
+
+struct tp_work;
+typedef int (tp_work_fn)(struct tp_work *);
+
+struct tp_work {
+	struct flist_head list;
+	tp_work_fn *fn;
+	int wait;
+	pthread_cond_t cv;
+	pthread_mutex_t lock;
+	volatile int done;
+};
+
+struct tp_data {
+	pthread_t thread;
+	pthread_cond_t cv;
+	pthread_mutex_t lock;
+	struct flist_head work;
+	volatile int thread_exit;
+	pthread_cond_t sleep_cv;
+	volatile int sleeping;
+};
+
+extern void tp_init(struct tp_data **);
+extern void tp_exit(struct tp_data **);
+extern void tp_queue_work(struct tp_data *, struct tp_work *);
+
+#endif
diff --git a/options.c b/options.c
index 6d326d4..3a3321f 100644
--- a/options.c
+++ b/options.c
@@ -3104,6 +3104,28 @@ struct fio_option fio_options[FIO_MAX_OPTS] = {
 		.category = FIO_OPT_C_LOG,
 		.group	= FIO_OPT_G_INVALID,
 	},
+#ifdef CONFIG_ZLIB
+	{
+		.name	= "log_compression",
+		.lname	= "Log compression",
+		.type	= FIO_OPT_INT,
+		.off1	= td_var_offset(log_gz),
+		.help	= "Log in compressed chunks of this size",
+		.minval	= 32 * 1024 * 1024ULL,
+		.maxval	= 512 * 1024 * 1024ULL,
+		.category = FIO_OPT_C_LOG,
+		.group	= FIO_OPT_G_INVALID,
+	},
+	{
+		.name	= "log_store_compressed",
+		.lname	= "Log store compressed",
+		.type	= FIO_OPT_BOOL,
+		.off1	= td_var_offset(log_gz_store),
+		.help	= "Store logs in a compressed format",
+		.category = FIO_OPT_C_LOG,
+		.group	= FIO_OPT_G_INVALID,
+	},
+#endif
 	{
 		.name	= "bwavgtime",
 		.lname	= "Bandwidth average time",
diff --git a/server.c b/server.c
index cd00cc6..e2a6f73 100644
--- a/server.c
+++ b/server.c
@@ -1225,10 +1225,10 @@ int fio_send_iolog(struct thread_data *td, struct io_log *log, const char *name)
 	for (i = 0; i < log->nr_samples; i++) {
 		struct io_sample *s = get_sample(log, i);
 
-		s->time	= cpu_to_le64(s->time);
-		s->val	= cpu_to_le64(s->val);
-		s->ddir	= cpu_to_le32(s->ddir);
-		s->bs	= cpu_to_le32(s->bs);
+		s->time		= cpu_to_le64(s->time);
+		s->val		= cpu_to_le64(s->val);
+		s->__ddir	= cpu_to_le32(s->__ddir);
+		s->bs		= cpu_to_le32(s->bs);
 
 		if (log->log_offset) {
 			struct io_sample_offset *so = (void *) s;
diff --git a/stat.c b/stat.c
index 58744a8..979c810 100644
--- a/stat.c
+++ b/stat.c
@@ -1565,7 +1565,7 @@ static void __add_log_sample(struct io_log *iolog, unsigned long val,
 			     enum fio_ddir ddir, unsigned int bs,
 			     unsigned long t, uint64_t offset)
 {
-	const int nr_samples = iolog->nr_samples;
+	uint64_t nr_samples = iolog->nr_samples;
 	struct io_sample *s;
 
 	if (iolog->disabled)
@@ -1579,21 +1579,31 @@ static void __add_log_sample(struct io_log *iolog, unsigned long val,
 		void *new_log;
 
 		new_size = 2 * iolog->max_samples * log_entry_sz(iolog);
-		new_log = realloc(iolog->log, new_size);
-		if (!new_log) {
-			log_err("fio: failed extending iolog! Will stop logging.\n");
-			iolog->disabled = 1;
-			return;
+
+		if (iolog->log_gz && (new_size > iolog->log_gz)) {
+			if (iolog_flush(iolog, 0)) {
+				log_err("fio: failed flushing iolog! Will stop logging.\n");
+				iolog->disabled = 1;
+				return;
+			}
+			nr_samples = iolog->nr_samples;
+		} else {
+			new_log = realloc(iolog->log, new_size);
+			if (!new_log) {
+				log_err("fio: failed extending iolog! Will stop logging.\n");
+				iolog->disabled = 1;
+				return;
+			}
+			iolog->log = new_log;
+			iolog->max_samples <<= 1;
 		}
-		iolog->log = new_log;
-		iolog->max_samples <<= 1;
 	}
 
 	s = get_sample(iolog, nr_samples);
 
 	s->val = val;
 	s->time = t;
-	s->ddir = ddir;
+	io_sample_set_ddir(iolog, s, ddir);
 	s->bs = bs;
 
 	if (iolog->log_offset) {
diff --git a/thread_options.h b/thread_options.h
index e53000a..e545a8f 100644
--- a/thread_options.h
+++ b/thread_options.h
@@ -109,6 +109,8 @@ struct thread_options {
 	unsigned int use_os_rand;
 	unsigned int log_avg_msec;
 	unsigned int log_offset;
+	unsigned int log_gz;
+	unsigned int log_gz_store;
 	unsigned int norandommap;
 	unsigned int softrandommap;
 	unsigned int bs_unaligned;
@@ -337,6 +339,8 @@ struct thread_options_pack {
 	uint32_t use_os_rand;
 	uint32_t log_avg_msec;
 	uint32_t log_offset;
+	uint32_t log_gz;
+	uint32_t log_gz_store;
 	uint32_t norandommap;
 	uint32_t softrandommap;
 	uint32_t bs_unaligned;
diff --git a/trim.c b/trim.c
index de792dc..a7f1b86 100644
--- a/trim.c
+++ b/trim.c
@@ -24,7 +24,7 @@ int get_next_trim(struct thread_data *td, struct io_u *io_u)
 		return 1;
 
 	assert(td->trim_entries);
-	ipo = flist_entry(td->trim_list.next, struct io_piece, trim_list);
+	ipo = flist_first_entry(&td->trim_list, struct io_piece, trim_list);
 	remove_trim_entry(td, ipo);
 
 	io_u->offset = ipo->offset;
diff --git a/verify.c b/verify.c
index 2615701..11963e1 100644
--- a/verify.c
+++ b/verify.c
@@ -1082,7 +1082,7 @@ int get_next_verify(struct thread_data *td, struct io_u *io_u)
 		assert(ipo->flags & IP_F_ONRB);
 		ipo->flags &= ~IP_F_ONRB;
 	} else if (!flist_empty(&td->io_hist_list)) {
-		ipo = flist_entry(td->io_hist_list.next, struct io_piece, list);
+		ipo = flist_first_entry(&td->io_hist_list, struct io_piece, list);
 
 		/*
 		 * Ensure that the associated IO has completed
@@ -1187,7 +1187,7 @@ static void *verify_async_thread(void *data)
 			continue;
 
 		while (!flist_empty(&list)) {
-			io_u = flist_entry(list.next, struct io_u, verify_list);
+			io_u = flist_first_entry(&list, struct io_u, verify_list);
 			flist_del(&io_u->verify_list);
 
 			ret = verify_io_u(td, io_u);
--
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