xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

mm/compaction: more trace to understand when/why compaction start/finish

Browse Source 
It is not well analyzed that when/why compaction start/finish or not.
With these new tracepoints, we can know much more about start/finish
reason of compaction.  I can find following bug with these tracepoint.

http://www.spinics.net/lists/linux-mm/msg81582.html

Signed-off-by: Joonsoo Kim <iamjoonsoo.kim@lge.com>
Cc: Vlastimil Babka <vbabka@suse.cz>
Cc: Mel Gorman <mgorman@suse.de>
Cc: David Rientjes <rientjes@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joonsoo Kim
2015-02-11 15:27:06 -08:00
committed by Linus Torvalds
parent e34d85f0e3
commit 837d026d56
3 changed files with 111 additions and 4 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
mm/compaction.c
View File

@@ -41,6 +41,8 @@ static const char *const compaction_status_string[] = {
"continue",
"partial",
"complete",
"no_suitable_page",
"not_suitable_zone",
};
#endif
@@ -1049,7 +1051,7 @@ static isolate_migrate_t isolate_migratepages(struct zone *zone,
return cc->nr_migratepages ? ISOLATE_SUCCESS : ISOLATE_NONE;
}
static int compact_finished(struct zone *zone, struct compact_control *cc,
static int __compact_finished(struct zone *zone, struct compact_control *cc,
const int migratetype)
{
unsigned int order;
@@ -1104,7 +1106,20 @@ static int compact_finished(struct zone *zone, struct compact_control *cc,
return COMPACT_PARTIAL;
}
return COMPACT_CONTINUE;
return COMPACT_NO_SUITABLE_PAGE;
}
static int compact_finished(struct zone *zone, struct compact_control *cc,
const int migratetype)
{
int ret;
ret = __compact_finished(zone, cc, migratetype);
trace_mm_compaction_finished(zone, cc->order, ret);
if (ret == COMPACT_NO_SUITABLE_PAGE)
ret = COMPACT_CONTINUE;
return ret;
}
/*
@@ -1114,7 +1129,7 @@ static int compact_finished(struct zone *zone, struct compact_control *cc,
* COMPACT_PARTIAL - If the allocation would succeed without compaction
* COMPACT_CONTINUE - If compaction should run now
*/
unsigned long compaction_suitable(struct zone *zone, int order,
static unsigned long __compaction_suitable(struct zone *zone, int order,
int alloc_flags, int classzone_idx)
{
int fragindex;
@@ -1158,11 +1173,24 @@ unsigned long compaction_suitable(struct zone *zone, int order,
*/
fragindex = fragmentation_index(zone, order);
if (fragindex >= 0 && fragindex <= sysctl_extfrag_threshold)
return COMPACT_SKIPPED;
return COMPACT_NOT_SUITABLE_ZONE;
return COMPACT_CONTINUE;
}
unsigned long compaction_suitable(struct zone *zone, int order,
int alloc_flags, int classzone_idx)
{
unsigned long ret;
ret = __compaction_suitable(zone, order, alloc_flags, classzone_idx);
trace_mm_compaction_suitable(zone, order, ret);
if (ret == COMPACT_NOT_SUITABLE_ZONE)
ret = COMPACT_SKIPPED;
return ret;
}
static int compact_zone(struct zone *zone, struct compact_control *cc)
{
int ret;
@@ -1376,6 +1404,8 @@ unsigned long try_to_compact_pages(gfp_t gfp_mask, unsigned int order,
if (!order || !may_enter_fs || !may_perform_io)
return COMPACT_SKIPPED;
trace_mm_compaction_try_to_compact_pages(order, gfp_mask, mode);
/* Compact each zone in the list */
for_each_zone_zonelist_nodemask(zone, z, ac->zonelist, ac->high_zoneidx,
ac->nodemask) {