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    Subject[RFC][PATCH -mm 2/2] mm: make shrink_all_memory try harder
    Date
    Make shrink_all_memory() repeat the attempts to free more memory if there
    seems to be no pages to free.


    Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
    ---
    mm/vmscan.c | 22 +++++++++++++++-------
    1 files changed, 15 insertions(+), 7 deletions(-)

    Index: linux-2.6.16-rc4-mm2/mm/vmscan.c
    ===================================================================
    --- linux-2.6.16-rc4-mm2.orig/mm/vmscan.c
    +++ linux-2.6.16-rc4-mm2/mm/vmscan.c
    @@ -33,6 +33,7 @@
    #include <linux/cpuset.h>
    #include <linux/notifier.h>
    #include <linux/rwsem.h>
    +#include <linux/delay.h>

    #include <asm/tlbflush.h>
    #include <asm/div64.h>
    @@ -1793,17 +1794,24 @@ unsigned long shrink_all_memory(unsigned
    struct reclaim_state reclaim_state = {
    .reclaimed_slab = 0,
    };
    + int retry = 2;

    current->reclaim_state = &reclaim_state;
    - for_each_pgdat(pgdat) {
    - unsigned long freed;
    + do {
    + for_each_pgdat(pgdat) {
    + unsigned long freed;

    - freed = balance_pgdat(pgdat, nr_to_free, 0);
    - ret += freed;
    - nr_to_free -= freed;
    - if (nr_to_free <= 0)
    + freed = balance_pgdat(pgdat, nr_to_free, 0);
    + ret += freed;
    + nr_to_free -= freed;
    + if (nr_to_free <= 0)
    + break;
    + }
    + if (ret > 0)
    break;
    - }
    + if (retry)
    + msleep_interruptible(100);
    + } while (retry--);
    current->reclaim_state = NULL;
    return ret;
    }
    -
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