Messages in this thread | | | Date | Tue, 22 Sep 2009 17:54:52 -0700 | From | Andrew Morton <> | Subject | Re: regression in page writeback |
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On Wed, 23 Sep 2009 08:22:20 +0800 Wu Fengguang <fengguang.wu@intel.com> wrote:
> Jens' per-bdi writeback has another improvement. In 2.6.31, when > superblocks A and B both have 100000 dirty pages, it will first > exhaust A's 100000 dirty pages before going on to sync B's.
That would only be true if someone broke 2.6.31. Did they?
SYSCALL_DEFINE0(sync) { wakeup_pdflush(0); sync_filesystems(0); sync_filesystems(1); if (unlikely(laptop_mode)) laptop_sync_completion(); return 0; }
the sync_filesystems(0) is supposed to non-blockingly start IO against all devices. It used to do that correctly. But people mucked with it so perhaps it no longer does.
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