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Date: Sun, 18 Feb 2007 15:59:16 -0800 From: Andrew Morton <akpm@...ux-foundation.org> To: Miklos Szeredi <miklos@...redi.hu> Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org Subject: Re: dirty balancing deadlock On Mon, 19 Feb 2007 00:22:11 +0100 Miklos Szeredi <miklos@...redi.hu> wrote: > > If so, writes to B will decrease the dirty memory threshold. > > Yes, but not by enough. Say A dirties a 1100 pages, limit is 1000. > Some pages queued for writeback (doesn't matter how much). B writes > back 1, 1099 dirty remain in A, zero in B. balance_dirty_pages() for > B doesn't know that there's nothing more to write back for B, it's > just waiting there for those 1099, which'll never get written. hm, OK, arguable. I guess something like this.. --- a/fs/fs-writeback.c~a +++ a/fs/fs-writeback.c @@ -356,7 +356,7 @@ int generic_sync_sb_inodes(struct super_ continue; /* Skip a congested blockdev */ } - if (wbc->bdi && bdi != wbc->bdi) { + if (wbc->bdi && bdi != wbc->bdi && bdi_write_congested(bdi)) { if (!sb_is_blkdev_sb(sb)) break; /* fs has the wrong queue */ list_move(&inode->i_list, &sb->s_dirty); _ but where's pdflush? It should be busily transferring dirtiness from A to B. > > The writeout code _should_ just sit there transferring dirtyiness from A to > > B and cleaning pages via B, looping around, alternating between both. > > > > What does sysrq-t say? > > This is the fuse daemon thread that got stuck. Where's pdflsuh? - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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