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    SubjectRe: [PATCH 12/14] vmscan: Do not writeback pages in direct reclaim
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    On Wed, Jul 7, 2010 at 5:27 AM, Johannes Weiner <hannes@cmpxchg.org> wrote:
    > On Tue, Jul 06, 2010 at 04:25:39PM +0100, Mel Gorman wrote:
    >> On Tue, Jul 06, 2010 at 08:24:57PM +0900, Minchan Kim wrote:
    >> > but it is still problem in case of swap file.
    >> > That's because swapout on swapfile cause file system writepage which
    >> > makes kernel stack overflow.
    >>
    >> I don't *think* this is a problem unless I missed where writing out to
    >> swap enters teh filesystem code. I'll double check.
    >
    > It bypasses the fs.  On swapon, the blocks are resolved
    > (mm/swapfile.c::setup_swap_extents) and then the writeout path uses
    > bios directly (mm/page_io.c::swap_writepage).
    >
    > (GFP_NOFS still includes __GFP_IO, so allows swapping)
    >
    >        Hannes

    Thanks, Hannes. You're right.
    Extents would be resolved by setup_swap_extents.
    Sorry for confusing, Mel.

    It was just my guessing about Kosaki's mention but he might say another story.
    Ignore me.

    --
    Kind regards,
    Minchan Kim
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