[lkml]   [2006]   [Feb]   [10]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: Terminate process that fails on a constrained allocation V3
    Christoph Lameter <> wrote:
    > Some allocations are restricted to a limited set of nodes (due to memory
    > policies or cpuset constraints). If the page allocator is not able to find
    > enough memory then that does not mean that overall system memory is low.
    > In particular going postal and more or less randomly shooting at processes
    > is not likely going to help the situation but may just lead to suicide (the
    > whole system coming down).
    > It is better to signal to the process that no memory exists given the
    > constraints that the process (or the configuration of the process) has
    > placed on the allocation behavior. The process may be killed but then the
    > sysadmin or developer can investigate the situation. The solution is similar
    > to what we do when running out of hugepages.
    > This patch adds a check before we kill processes. At that
    > point performance considerations do not matter much so we just scan the zonelist
    > and reconstruct a list of nodes. If the list of nodes does not contain all
    > online nodes then this is a constrained allocation and we should kill the
    > currnet process.

    Looks sane, thanks. I made constrained_alloc() inline, to give the
    compiler the best-possible chance of eliminating the impossible-on-UMA
    switch cases.

    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: 2006-02-10 06:22    [W:0.023 / U:89.784 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site