The patch titled
per-task-delay-accounting: delay accounting usage of taskstats interface
has been added to the -mm tree. Its filename is
per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface.patch
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: per-task-delay-accounting: delay accounting usage of taskstats interface
From: Balbir Singh <balbir@xxxxxxxxxx>
Usage of taskstats interface by delay accounting.
Signed-off-by: Shailabh Nagar <nagar@xxxxxxxxxx>
Signed-off-by: Balbir Singh <balbir@xxxxxxxxxx>
Cc: Jes Sorensen <jes@xxxxxxx>
Cc: Peter Chubb <peterc@xxxxxxxxxxxxxxxxxx>
Cc: Erich Focht <efocht@xxxxxxxxxx>
Cc: Levent Serinol <lserinol@xxxxxxxxx>
Cc: Jay Lan <jlan@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
include/linux/delayacct.h | 13 ++++++++
include/linux/taskstats.h | 49 +++++++++++++++++++++++++++++++
include/linux/taskstats_kern.h | 1
init/Kconfig | 1
kernel/delayacct.c | 47 +++++++++++++++++++++++++++++
kernel/taskstats.c | 17 +++++++++-
6 files changed, 125 insertions(+), 3 deletions(-)
diff -puN include/linux/taskstats_kern.h~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface include/linux/taskstats_kern.h
--- a/include/linux/taskstats_kern.h~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface
+++ a/include/linux/taskstats_kern.h
@@ -17,6 +17,7 @@ enum {
#ifdef CONFIG_TASKSTATS
extern kmem_cache_t *taskstats_cache;
+extern struct mutex taskstats_exit_mutex;
static inline void taskstats_exit_alloc(struct taskstats **ptidstats,
struct taskstats **ptgidstats)
diff -puN kernel/delayacct.c~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface kernel/delayacct.c
--- a/kernel/delayacct.c~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface
+++ a/kernel/delayacct.c
@@ -48,8 +48,11 @@ void __delayacct_tsk_init(struct task_st
void __delayacct_tsk_exit(struct task_struct *tsk)
{
- kmem_cache_free(delayacct_cache, tsk->delays);
+ struct task_delay_info *delays = tsk->delays;
+ mutex_lock(&taskstats_exit_mutex);
tsk->delays = NULL;
+ mutex_unlock(&taskstats_exit_mutex);
+ kmem_cache_free(delayacct_cache, delays);
}
/*
@@ -104,3 +107,45 @@ void __delayacct_blkio_end(void)
¤t->delays->blkio_delay,
¤t->delays->blkio_count);
}
+
+int __delayacct_add_tsk(struct taskstats *d, struct task_struct *tsk)
+{
+ s64 tmp;
+ struct timespec ts;
+ unsigned long t1,t2,t3;
+
+ tmp = (s64)d->cpu_run_real_total;
+ tmp += (u64)(tsk->utime + tsk->stime) * TICK_NSEC;
+ d->cpu_run_real_total = (tmp < (s64)d->cpu_run_real_total) ? 0 : tmp;
+
+ /*
+ * No locking available for sched_info (and too expensive to add one)
+ * Mitigate by taking snapshot of values
+ */
+ t1 = tsk->sched_info.pcnt;
+ t2 = tsk->sched_info.run_delay;
+ t3 = tsk->sched_info.cpu_time;
+
+ d->cpu_count += t1;
+
+ jiffies_to_timespec(t2, &ts);
+ tmp = (s64)d->cpu_delay_total + timespec_to_ns(&ts);
+ d->cpu_delay_total = (tmp < (s64)d->cpu_delay_total) ? 0 : tmp;
+
+ tmp = (s64)d->cpu_run_virtual_total + (s64)jiffies_to_usecs(t3) * 1000;
+ d->cpu_run_virtual_total =
+ (tmp < (s64)d->cpu_run_virtual_total) ? 0 : tmp;
+
+ /* zero XXX_total, non-zero XXX_count implies XXX stat overflowed */
+
+ spin_lock(&tsk->delays->lock);
+ tmp = d->blkio_delay_total + tsk->delays->blkio_delay;
+ d->blkio_delay_total = (tmp < d->blkio_delay_total) ? 0 : tmp;
+ tmp = d->swapin_delay_total + tsk->delays->swapin_delay;
+ d->swapin_delay_total = (tmp < d->swapin_delay_total) ? 0 : tmp;
+ d->blkio_count += tsk->delays->blkio_count;
+ d->swapin_count += tsk->delays->swapin_count;
+ spin_unlock(&tsk->delays->lock);
+
+ return 0;
+}
diff -puN kernel/taskstats.c~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface kernel/taskstats.c
--- a/kernel/taskstats.c~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface
+++ a/kernel/taskstats.c
@@ -18,13 +18,14 @@
#include <linux/kernel.h>
#include <linux/taskstats_kern.h>
+#include <linux/delayacct.h>
#include <net/genetlink.h>
#include <asm/atomic.h>
static DEFINE_PER_CPU(__u32, taskstats_seqnum) = { 0 };
static int family_registered = 0;
kmem_cache_t *taskstats_cache;
-static DEFINE_MUTEX(taskstats_exit_mutex);
+DEFINE_MUTEX(taskstats_exit_mutex);
static struct genl_family family = {
.id = GENL_ID_GENERATE,
@@ -120,7 +121,10 @@ static int fill_pid(pid_t pid, struct ta
* goto err;
*/
-err:
+ rc = delayacct_add_tsk(stats, tsk);
+ stats->version = TASKSTATS_VERSION;
+
+ /* Define err: label here if needed */
put_task_struct(tsk);
return rc;
@@ -152,8 +156,14 @@ static int fill_tgid(pid_t tgid, struct
* break;
*/
+ rc = delayacct_add_tsk(stats, tsk);
+ if (rc)
+ break;
+
} while_each_thread(first, tsk);
read_unlock(&tasklist_lock);
+ stats->version = TASKSTATS_VERSION;
+
/*
* Accounting subsytems can also add calls here if they don't
@@ -183,6 +193,7 @@ static int taskstats_send_stats(struct s
if (rc < 0)
return rc;
+ mutex_lock(&taskstats_exit_mutex);
if (info->attrs[TASKSTATS_CMD_ATTR_PID]) {
u32 pid = nla_get_u32(info->attrs[TASKSTATS_CMD_ATTR_PID]);
rc = fill_pid(pid, NULL, &stats);
@@ -208,6 +219,7 @@ static int taskstats_send_stats(struct s
goto err;
}
+ mutex_unlock(&taskstats_exit_mutex);
nla_nest_end(rep_skb, na);
return send_reply(rep_skb, info->snd_pid, TASKSTATS_MSG_UNICAST);
@@ -216,6 +228,7 @@ nla_put_failure:
return genlmsg_cancel(rep_skb, reply);
err:
nlmsg_free(rep_skb);
+ mutex_unlock(&taskstats_exit_mutex);
return rc;
}
diff -puN include/linux/delayacct.h~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface include/linux/delayacct.h
--- a/include/linux/delayacct.h~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface
+++ a/include/linux/delayacct.h
@@ -18,6 +18,7 @@
#define _LINUX_DELAYACCT_H
#include <linux/sched.h>
+#include <linux/taskstats_kern.h>
/*
* Per-task flags relevant to delay accounting
@@ -35,6 +36,7 @@ extern void __delayacct_tsk_init(struct
extern void __delayacct_tsk_exit(struct task_struct *);
extern void __delayacct_blkio_start(void);
extern void __delayacct_blkio_end(void);
+extern int __delayacct_add_tsk(struct taskstats *, struct task_struct *);
static inline void delayacct_set_flag(int flag)
{
@@ -74,6 +76,14 @@ static inline void delayacct_blkio_end(v
__delayacct_blkio_end();
}
+static inline int delayacct_add_tsk(struct taskstats *d,
+ struct task_struct *tsk)
+{
+ if (!tsk->delays)
+ return -EINVAL;
+ return __delayacct_add_tsk(d, tsk);
+}
+
#else
static inline void delayacct_set_flag(int flag)
{}
@@ -89,6 +99,9 @@ static inline void delayacct_blkio_start
{}
static inline void delayacct_blkio_end(void)
{}
+static inline int delayacct_add_tsk(struct taskstats *d,
+ struct task_struct *tsk)
+{ return 0; }
#endif /* CONFIG_TASK_DELAY_ACCT */
#endif
diff -puN include/linux/taskstats.h~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface include/linux/taskstats.h
--- a/include/linux/taskstats.h~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface
+++ a/include/linux/taskstats.h
@@ -35,6 +35,55 @@ struct taskstats {
/* Version 1 */
__u64 version;
+
+ /* Delay accounting fields start
+ *
+ * All values, until comment "Delay accounting fields end" are
+ * available only if delay accounting is enabled, even though the last
+ * few fields are not delays
+ *
+ * xxx_count is the number of delay values recorded
+ * xxx_delay_total is the corresponding cumulative delay in nanoseconds
+ *
+ * xxx_delay_total wraps around to zero on overflow
+ * xxx_count incremented regardless of overflow
+ */
+
+ /* Delay waiting for cpu, while runnable
+ * count, delay_total NOT updated atomically
+ */
+ __u64 cpu_count;
+ __u64 cpu_delay_total;
+
+ /* Following four fields atomically updated using task->delays->lock */
+
+ /* Delay waiting for synchronous block I/O to complete
+ * does not account for delays in I/O submission
+ */
+ __u64 blkio_count;
+ __u64 blkio_delay_total;
+
+ /* Delay waiting for page fault I/O (swap in only) */
+ __u64 swapin_count;
+ __u64 swapin_delay_total;
+
+ /* cpu "wall-clock" running time
+ * On some architectures, value will adjust for cpu time stolen
+ * from the kernel in involuntary waits due to virtualization.
+ * Value is cumulative, in nanoseconds, without a corresponding count
+ * and wraps around to zero silently on overflow
+ */
+ __u64 cpu_run_real_total;
+
+ /* cpu "virtual" running time
+ * Uses time intervals seen by the kernel i.e. no adjustment
+ * for kernel's involuntary waits due to virtualization.
+ * Value is cumulative, in nanoseconds, without a corresponding count
+ * and wraps around to zero silently on overflow
+ */
+ __u64 cpu_run_virtual_total;
+ /* Delay accounting fields end */
+ /* version 1 ends here */
};
diff -puN init/Kconfig~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface init/Kconfig
--- a/init/Kconfig~per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface
+++ a/init/Kconfig
@@ -172,6 +172,7 @@ config TASKSTATS
config TASK_DELAY_ACCT
bool "Enable per-task delay accounting (EXPERIMENTAL)"
+ depends on TASKSTATS
help
Collect information on time spent by a task waiting for system
resources like cpu, synchronous block I/O completion and swapping
_
Patches currently in -mm which might be from balbir@xxxxxxxxxx are
origin.patch
per-task-delay-accounting-setup.patch
per-task-delay-accounting-setup-fix-1.patch
per-task-delay-accounting-setup-fix-2.patch
per-task-delay-accounting-sync-block-i-o-and-swapin-delay-collection.patch
per-task-delay-accounting-sync-block-i-o-and-swapin-delay-collection-fix-1.patch
per-task-delay-accounting-cpu-delay-collection-via-schedstats.patch
per-task-delay-accounting-cpu-delay-collection-via-schedstats-fix-1.patch
per-task-delay-accounting-utilities-for-genetlink-usage.patch
per-task-delay-accounting-taskstats-interface.patch
per-task-delay-accounting-taskstats-interface-fix-1.patch
per-task-delay-accounting-taskstats-interface-fix-2.patch
per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface.patch
per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface-use-portable-cputime-api-in-__delayacct_add_tsk.patch
per-task-delay-accounting-delay-accounting-usage-of-taskstats-interface-fix-return-value-of-delayacct_add_tsk.patch
revised-locking-for-taskstats-interface.patch
per-task-delay-accounting-documentation.patch
per-task-delay-accounting-proc-export-of-aggregated-block-i-o-delays.patch
per-task-delay-accounting-proc-export-of-aggregated-block-i-o-delays-warning-fix.patch
task-watchers-register-per-task-delay-accounting.patch
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