The patch titled dquot: do full inode dirty in allocating space has been added to the -mm tree. Its filename is dquot-do-full-inode-dirty-in-allocating-space.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** See http://userweb.kernel.org/~akpm/stuff/added-to-mm.txt to find out what to do about this The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/ ------------------------------------------------------ Subject: dquot: do full inode dirty in allocating space From: Shaohua Li <shaohua.li@xxxxxxxxx> Alex Shi found a regression when doing ffsb test. The test has several threads, and each thread creates a small file, write to it and then delete it. ffsb reports about 20% regression and Alex bisected it to 43d2932d88e4 ("quota: Use mark_inode_dirty_sync instead of mark_inode_dirty"). The test will call __mark_inode_dirty 3 times. Without this commit, we only take inode_lock one time, while with it, we take the lock 3 times with flags ( I_DIRTY_SYNC,I_DIRTY_PAGES,I_DIRTY). Perf shows the lock contention increased too much. Below proposed patch fixes it. fs is allocating blocks, which usually means file writes and the inode will be dirtied soon. We fully dirty the inode to reduce some inode_lock contention in several calls of __mark_inode_dirty. Signed-off-by: Shaohua Li <shaohua.li@xxxxxxxxx> Signed-off-by: Alex Shi <alex.shi@xxxxxxxxx> Cc: Jan Kara <jack@xxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- include/linux/quotaops.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff -puN include/linux/quotaops.h~dquot-do-full-inode-dirty-in-allocating-space include/linux/quotaops.h --- a/include/linux/quotaops.h~dquot-do-full-inode-dirty-in-allocating-space +++ a/include/linux/quotaops.h @@ -275,7 +275,7 @@ static inline int dquot_alloc_space(stru ret = dquot_alloc_space_nodirty(inode, nr); if (!ret) - mark_inode_dirty_sync(inode); + mark_inode_dirty(inode); return ret; } _ Patches currently in -mm which might be from shaohua.li@xxxxxxxxx are dquot-do-full-inode-dirty-in-allocating-space.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html