[lkml]   [2011]   [Nov]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [Linaro-mm-sig] [PATCHv17 0/11] Contiguous Memory Allocator
    2011/11/18 Michal Nazarewicz <>:
    > On Fri, 18 Nov 2011 22:20:48 +0100, sandeep patil <>
    > wrote:
    >> I am running a simple test to allocate contiguous regions and write a log
    >> on
    >> in a file on sdcard simultaneously. I can reproduce this migration failure
    >> 100%
    >> times with it.
    >> when I tracked the pages that failed to migrate, I found them on the
    >> buffer head lru
    >> list with a reference held on the buffer_head in the page, which
    >> causes drop_buffers()
    >> to fail.
    >> So, i guess my question is, until all the migration failures are
    >> tracked down and fixed,
    >> is there a plan to retry the contiguous allocation from a new range in
    >> the CMA region?
    > No.  Current CMA implementation will stick to the same range of pages also
    > on consequent allocations of the same size.

    Doesn't that mean the drivers that fail to allocate from contiguous DMA region
    will fail, if the migration fails?

    ~ sandeep
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to
    More majordomo info at
    Please read the FAQ at

     \ /
      Last update: 2011-11-19 00:33    [W:0.028 / U:2.532 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site