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| author | Jens Axboe <jens.axboe@oracle.com> | 2010-05-17 12:55:07 +0200 |
|---|---|---|
| committer | Jens Axboe <jens.axboe@oracle.com> | 2010-05-17 12:55:07 +0200 |
| commit | e913fc825dc685a444cb4c1d0f9d32f372f59861 (patch) | |
| tree | e470697e43ffe4028ac81c17d3ef90ee9f30bcfb /mm/page-writeback.c | |
| parent | 69b62d01ec44fe0d505d89917392347732135a4d (diff) | |
| download | blackbird-op-linux-e913fc825dc685a444cb4c1d0f9d32f372f59861.tar.gz blackbird-op-linux-e913fc825dc685a444cb4c1d0f9d32f372f59861.zip | |
writeback: fix WB_SYNC_NONE writeback from umount
When umount calls sync_filesystem(), we first do a WB_SYNC_NONE
writeback to kick off writeback of pending dirty inodes, then follow
that up with a WB_SYNC_ALL to wait for it. Since umount already holds
the sb s_umount mutex, WB_SYNC_NONE ends up doing nothing and all
writeback happens as WB_SYNC_ALL. This can greatly slow down umount,
since WB_SYNC_ALL writeback is a data integrity operation and thus
a bigger hammer than simple WB_SYNC_NONE. For barrier aware file systems
it's a lot slower.
Signed-off-by: Jens Axboe <jens.axboe@oracle.com>
Diffstat (limited to 'mm/page-writeback.c')
| -rw-r--r-- | mm/page-writeback.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/mm/page-writeback.c b/mm/page-writeback.c index d0f2b3765f8d..53b2fcf2d283 100644 --- a/mm/page-writeback.c +++ b/mm/page-writeback.c @@ -597,7 +597,7 @@ static void balance_dirty_pages(struct address_space *mapping, (!laptop_mode && ((global_page_state(NR_FILE_DIRTY) + global_page_state(NR_UNSTABLE_NFS)) > background_thresh))) - bdi_start_writeback(bdi, NULL, 0); + bdi_start_writeback(bdi, NULL, 0, 0); } void set_page_dirty_balance(struct page *page, int page_mkwrite) @@ -705,7 +705,7 @@ void laptop_mode_timer_fn(unsigned long data) */ if (bdi_has_dirty_io(&q->backing_dev_info)) - bdi_start_writeback(&q->backing_dev_info, NULL, nr_pages); + bdi_start_writeback(&q->backing_dev_info, NULL, 0, nr_pages); } /* |
