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    Subject[PATCH] synchronous lumpy: improve commentary on writeback wait
    Date

    Improve code commentary on the initial writeback wait in synchronous
    reclaim mode.

    Signed-off-by: Andy Whitcroft <apw@shadowen.org>
    ---
    mm/vmscan.c | 8 ++++++++
    1 files changed, 8 insertions(+), 0 deletions(-)
    diff --git a/mm/vmscan.c b/mm/vmscan.c
    index b1e9291..a6e65d0 100644
    --- a/mm/vmscan.c
    +++ b/mm/vmscan.c
    @@ -479,6 +479,14 @@ static unsigned long shrink_page_list(struct list_head *page_list,
    (PageSwapCache(page) && (sc->gfp_mask & __GFP_IO));

    if (PageWriteback(page)) {
    + /*
    + * Synchronous reclaim is performed in two passes,
    + * first an asynchronous pass over the list to
    + * start parallel writeback, and a second synchronous
    + * pass to wait for the IO to complete. Wait here
    + * for any page for which writeback has already
    + * started.
    + */
    if (sync_writeback == PAGEOUT_IO_SYNC && may_enter_fs)
    wait_on_page_writeback(page);
    else
    -
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