Re: NR_UNSTABLE_FS vs. NR_FILE_DIRTY: double counting pages?

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Trond Myklebust wrote:
On Fri, 2007-04-27 at 18:21 -0700, Ethan Solomita wrote:
There are several places where we add together NR_UNSTABLE_FS and
NF_FILE_DIRTY:

sync_inodes_sb()
balance_dirty_pages()
wakeup_pdflush()
wb_kupdate()
prefetch_suitable()

    I can trace a standard codepath where it seems both of these are set
on the same page:

nfs_file_aops.commit_write ->
    nfs_commit_write
    nfs_updatepages
    nfs_writepage_setup
    nfs_wb_page
    nfs_wb_page_priority
    nfs_writepage_locked
    nfs_flush_mapping
    nfs_flush_list
    nfs_flush_multi
    nfs_write_partial_ops.rpc_call_done
    nfs_writeback_done_partial
    nfs_writepage_release
    nfs_reschedule_unstable_write
    nfs_mark_request_commit
    incr NR_UNSTABLE_NFS

nfs_file_aops.commit_write ->
    nfs_commit_write
    nfs_updatepage
    __set_page_dirty_nobuffers
    incr NF_FILE_DIRTY


    This is the standard code path that derives from sys_write(). Can
someone either show how this code sequence can't happen, or confirm for
me that there's a bug?
    -- Ethan

It should not happen. If the page is on the unstable list, then it will
be committed before nfs_updatepage is allowed to redirty it. See the
recent fixes in 2.6.21-rc7.

Above I present a codepath called straight from sys_write() which seems to do what I say. I could be wrong, but can you address the code paths I show above which seem to set both?
	-- Ethan
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