Commit f3ced7cd authored by Pekka Enberg's avatar Pekka Enberg Committed by Ingo Molnar
Browse files

perf kmem: Add --sort hit and --sort frag 



This patch adds support for "--sort hit" and "--sort frag" to
the "perf kmem" tool. The former was already mentioned in the
help text and the latter is useful for finding call-sites that
exhibit worst case behavior for SLAB allocators.

Signed-off-by: default avatarPekka Enberg <penberg@cs.helsinki.fi>
Cc: Li Zefan <lizf@cn.fujitsu.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Eduard - Gabriel Munteanu <eduard.munteanu@linux360.ro>
Cc: linux-mm@kvack.org <linux-mm@kvack.org>
LKML-Reference: <1258883880-7149-1-git-send-email-penberg@cs.helsinki.fi>
Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
parent 96b02d78

tools/perf/builtin-kmem.c

+28 −1
Original line number Diff line number Diff line
@@ -443,6 +443,15 @@ static int callsite_cmp(struct alloc_stat *l, struct alloc_stat *r) 
	return 0;

}



static int hit_cmp(struct alloc_stat *l, struct alloc_stat *r)

{

	if (l->hit < r->hit)

		return -1;

	else if (l->hit > r->hit)

		return 1;

	return 0;

}



static int bytes_cmp(struct alloc_stat *l, struct alloc_stat *r)

{

	if (l->bytes_alloc < r->bytes_alloc)
@@ -452,6 +461,20 @@ static int bytes_cmp(struct alloc_stat *l, struct alloc_stat *r) 
	return 0;

}



static int frag_cmp(struct alloc_stat *l, struct alloc_stat *r)

{

	double x, y;



	x = fragmentation(l->bytes_req, l->bytes_alloc);

	y = fragmentation(r->bytes_req, r->bytes_alloc);



	if (x < y)

		return -1;

	else if (x > y)

		return 1;

	return 0;

}



static int parse_sort_opt(const struct option *opt __used,

			  const char *arg, int unset __used)

{
@@ -464,8 +487,12 @@ static int parse_sort_opt(const struct option *opt __used, 
		sort_fn = ptr_cmp;

	else if (strcmp(arg, "call_site") == 0)

		sort_fn = callsite_cmp;

	else if (strcmp(arg, "hit") == 0)

		sort_fn = hit_cmp;

	else if (strcmp(arg, "bytes") == 0)

		sort_fn = bytes_cmp;

	else if (strcmp(arg, "frag") == 0)

		sort_fn = frag_cmp;

	else

		return -1;
@@ -517,7 +544,7 @@ static const struct option kmem_options[] = { 
		     "stat selector, Pass 'alloc' or 'caller'.",

		     parse_stat_opt),

	OPT_CALLBACK('s', "sort", NULL, "key",

		     "sort by key: ptr, call_site, hit, bytes",

		     "sort by key: ptr, call_site, hit, bytes, frag",

		     parse_sort_opt),

	OPT_CALLBACK('l', "line", NULL, "num",

		     "show n lins",

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