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mm: migrate: Add a tracepoint for migrate_pages

Browse source 
The pgmigrate_success and pgmigrate_fail vmstat counters tells the user
about migration activity but not the type or the reason. This patch adds
a tracepoint to identify the type of page migration and why the page is
being migrated.

Signed-off-by: Mel Gorman <[email protected]>
Reviewed-by: Rik van Riel <[email protected]>
This commit is contained in:
Mel Gorman 2012-10-19 14:07:31 +01:00
commit 7b2a2d4a18
8 changed files with 82 additions and 10 deletions
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10
mm/migrate.c
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@ -38,6 +38,9 @@
#include <asm/tlbflush.h>
#define CREATE_TRACE_POINTS
#include <trace/events/migrate.h>
#include "internal.h"
/*
@ -958,7 +961,7 @@ out:
*/
int migrate_pages(struct list_head *from,
new_page_t get_new_page, unsigned long private, bool offlining,
enum migrate_mode mode)
enum migrate_mode mode, int reason)
{
int retry = 1;
int nr_failed = 0;
@ -1004,6 +1007,8 @@ out:
count_vm_events(PGMIGRATE_SUCCESS, nr_succeeded);
if (nr_failed)
count_vm_events(PGMIGRATE_FAIL, nr_failed);
trace_mm_migrate_pages(nr_succeeded, nr_failed, mode, reason);
if (!swapwrite)
current->flags &= ~PF_SWAPWRITE;
@ -1145,7 +1150,8 @@ set_status:
err = 0;
if (!list_empty(&pagelist)) {
err = migrate_pages(&pagelist, new_page_node,
(unsigned long)pm, 0, MIGRATE_SYNC);
(unsigned long)pm, 0, MIGRATE_SYNC,
MR_SYSCALL);
if (err)
putback_lru_pages(&pagelist);
}