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| author | Vinayak Menon <vinmenon@codeaurora.org> | 2015-03-26 11:58:45 +0530 |
|---|---|---|
| committer | David Keitel <dkeitel@codeaurora.org> | 2016-03-22 11:03:54 -0700 |
| commit | 3086328d5ff69cee18399a68dd9fd9c5f10a4c2d (patch) | |
| tree | 8f865af55b3d8221a897248b0329cc46a2f7fda0 /mm/page-writeback.c | |
| parent | d487a9f1f7291870ebeac3bc243f9fe65dcdfefb (diff) | |
mm: page-writeback: fix page state calculation in throttle_vm_writeout
It was found that a number of tasks were blocked in the reclaim path
(throttle_vm_writeout) for seconds, because of vmstat_diff not being
synced in time. Fix that by adding a new function
global_page_state_snapshot.
Signed-off-by: Vinayak Menon <vinmenon@codeaurora.org>
Change-Id: Iec167635ad724a55c27bdbd49eb8686e7857216c
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index d15d88c8efa1..112c0bebfff3 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -1938,6 +1938,12 @@ void throttle_vm_writeout(gfp_t gfp_mask) if (global_page_state(NR_UNSTABLE_NFS) + global_page_state(NR_WRITEBACK) <= dirty_thresh) break; + /* Try safe version */ + else if (unlikely(global_page_state_snapshot(NR_UNSTABLE_NFS) + + global_page_state_snapshot(NR_WRITEBACK) <= + dirty_thresh)) + break; + congestion_wait(BLK_RW_ASYNC, HZ/10); /* |