Commit-ID: 4c4ba21d2c3659e4c0421533939b58a8fd9f06c9
Gitweb: http://git.kernel.org/tip/4c4ba21d2c3659e4c0421533939b58a8fd9f06c9
Author: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
AuthorDate: Wed, 25 Mar 2009 12:30:26 +0100
Committer: Ingo Molnar <mingo@xxxxxxx>
CommitDate: Mon, 6 Apr 2009 09:30:34 +0200
perf_counter: kerneltop: mmap_pages argument
provide a knob to set the number of mmap data pages.
Signed-off-by: Mike Galbraith <efault@xxxxxx>
Signed-off-by: Peter Zijlstra <a.p.zijlstra@xxxxxxxxx>
Cc: Paul Mackerras <paulus@xxxxxxxxx>
Cc: Mike Galbraith <efault@xxxxxx>
Cc: Arjan van de Ven <arjan@xxxxxxxxxxxxx>
Cc: Wu Fengguang <fengguang.wu@xxxxxxxxx>
Orig-LKML-Reference: <20090325113317.104545398@xxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
---
Documentation/perf_counter/kerneltop.c | 31 +++++++++++++++++++++++++------
1 files changed, 25 insertions(+), 6 deletions(-)
diff --git a/Documentation/perf_counter/kerneltop.c b/Documentation/perf_counter/kerneltop.c
index 7ebde7a..3e45bf6 100644
--- a/Documentation/perf_counter/kerneltop.c
+++ b/Documentation/perf_counter/kerneltop.c
@@ -178,6 +178,7 @@ static int nr_cpus = 0;
static int nmi = 1;
static int group = 0;
static unsigned int page_size;
+static unsigned int mmap_pages = 4;
static char *vmlinux;
@@ -326,6 +327,7 @@ static void display_help(void)
" -x path --vmlinux=<path> # the vmlinux binary, required for -s use\n"
" -z --zero # zero counts after display\n"
" -D --dump_symtab # dump symbol table to stderr on startup\n"
+ " -m pages --mmap_pages=<pages> # number of mmap data pages\n"
);
exit(0);
@@ -732,7 +734,9 @@ static int read_symbol(FILE *in, struct sym_entry *s)
/* Tag events to be skipped. */
if (!strcmp("default_idle", s->sym) || !strcmp("cpu_idle", s->sym))
s->skip = 1;
- if (!strcmp("enter_idle", s->sym) || !strcmp("exit_idle", s->sym))
+ else if (!strcmp("enter_idle", s->sym) || !strcmp("exit_idle", s->sym))
+ s->skip = 1;
+ else if (!strcmp("mwait_idle", s->sym))
s->skip = 1;
if (filter_match == 1) {
@@ -1042,9 +1046,10 @@ static void process_options(int argc, char *argv[])
{"symbol", required_argument, NULL, 's'},
{"stat", no_argument, NULL, 'S'},
{"zero", no_argument, NULL, 'z'},
+ {"mmap_pages", required_argument, NULL, 'm'},
{NULL, 0, NULL, 0 }
};
- int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hn:p:s:Sx:z",
+ int c = getopt_long(argc, argv, "+:ac:C:d:De:f:g:hn:m:p:s:Sx:z",
long_options, &option_index);
if (c == -1)
break;
@@ -1081,6 +1086,7 @@ static void process_options(int argc, char *argv[])
case 'S': run_perfstat = 1; break;
case 'x': vmlinux = strdup(optarg); break;
case 'z': zero = 1; break;
+ case 'm': mmap_pages = atoi(optarg); break;
default: error = 1; break;
}
}
@@ -1134,17 +1140,30 @@ repeat:
return head;
}
+struct timeval last_read, this_read;
+
static void mmap_read(struct mmap_data *md)
{
unsigned int head = mmap_read_head(md);
unsigned int old = md->prev;
unsigned char *data = md->base + page_size;
+ gettimeofday(&this_read, NULL);
+
if (head - old > md->mask) {
- printf("ERROR: failed to keep up with mmap data\n");
- exit(-1);
+ struct timeval iv;
+ unsigned long msecs;
+
+ timersub(&this_read, &last_read, &iv);
+ msecs = iv.tv_sec*1000 + iv.tv_usec/1000;
+
+ fprintf(stderr, "WARNING: failed to keep up with mmap data. Last read %lu msecs ago.\n", msecs);
+
+ old = head;
}
+ last_read = this_read;
+
for (; old != head;) {
__u64 *ptr = (__u64 *)&data[old & md->mask];
old += sizeof(__u64);
@@ -1220,8 +1239,8 @@ int main(int argc, char *argv[])
mmap_array[i][counter].counter = counter;
mmap_array[i][counter].prev = 0;
- mmap_array[i][counter].mask = 2*page_size - 1;
- mmap_array[i][counter].base = mmap(NULL, 3*page_size,
+ mmap_array[i][counter].mask = mmap_pages*page_size - 1;
+ mmap_array[i][counter].base = mmap(NULL, (mmap_pages+1)*page_size,
PROT_READ, MAP_SHARED, fd[i][counter], 0);
if (mmap_array[i][counter].base == MAP_FAILED) {
printf("kerneltop error: failed to mmap with %d (%s)\n",
--
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