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    Subject[34-longterm 093/209] nommu: yield CPU while disposing VM
    Date
    From: Steven J. Magnani <steve@digidescorp.com>

    =====================================================================
    | This is a commit scheduled for the next v2.6.34 longterm release. |
    | If you see a problem with using this for longterm, please comment.|
    =====================================================================

    commit 04c3496152394d17e3bc2316f9731ee3e8a026bc upstream.

    Depending on processor speed, page size, and the amount of memory a
    process is allowed to amass, cleanup of a large VM may freeze the system
    for many seconds. This can result in a watchdog timeout.

    Make sure other tasks receive some service when cleaning up large VMs.

    Signed-off-by: Steven J. Magnani <steve@digidescorp.com>
    Cc: Greg Ungerer <gerg@snapgear.com>
    Reviewed-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
    Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
    ---
    mm/nommu.c | 1 +
    1 files changed, 1 insertions(+), 0 deletions(-)

    diff --git a/mm/nommu.c b/mm/nommu.c
    index 28994ee..1fc13c0 100644
    --- a/mm/nommu.c
    +++ b/mm/nommu.c
    @@ -1669,6 +1669,7 @@ void exit_mmap(struct mm_struct *mm)
    mm->mmap = vma->vm_next;
    delete_vma_from_mm(vma);
    delete_vma(mm, vma);
    + cond_resched();
    }

    kleave("");
    --
    1.7.4.4


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