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| author | Mel Gorman <mgorman@suse.de> | 2012-10-19 14:07:31 +0100 |
|---|---|---|
| committer | Mel Gorman <mgorman@suse.de> | 2012-12-11 14:28:35 +0000 |
| commit | 7b2a2d4a18fffac3c4872021529b0657896db788 (patch) | |
| tree | a0f05be191f12711a774368f6feb15bcd2eebf1a /mm/migrate.c | |
| parent | 5647bc293ab15f66a7b1cda850c5e9d162a6c7c2 (diff) | |
| download | lwn-7b2a2d4a18fffac3c4872021529b0657896db788.tar.gz lwn-7b2a2d4a18fffac3c4872021529b0657896db788.zip | |
mm: migrate: Add a tracepoint for migrate_pages
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 <mgorman@suse.de>
Reviewed-by: Rik van Riel <riel@redhat.com>
Diffstat (limited to 'mm/migrate.c')
| -rw-r--r-- | mm/migrate.c | 10 |
1 files changed, 8 insertions, 2 deletions
diff --git a/mm/migrate.c b/mm/migrate.c index 04687f69cc17..27be9c923dc1 100644 --- a/mm/migrate.c +++ b/mm/migrate.c @@ -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); } |