lkml.org 
[lkml]   [2007]   [Jul]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    Date
    From
    SubjectRe: [PATCH -rt 2/5] Thread Migration Preemption - v2
    On 07/14, Peter Zijlstra wrote:
    >
    > From: Mathieu Desnoyers <mathieu.desnoyers@polymtl.ca>
    >
    > This patch adds the ability to protect critical sections from migration to
    > another CPU without disabling preemption.
    >
    > This will be useful to minimize the amount of preemption disabling for the -rt
    > patch. It will help leveraging improvements brought by the local_t types in
    > asm/local.h (see Documentation/local_ops.txt). Note that the updates done to
    > variables protected by migrate_disable must be either atomic or protected from
    > concurrent updates done by other threads.
    >
    > Typical use:
    >
    > migrate_disable();
    > local_inc(&__get_cpu_var(&my_local_t_var));
    > migrate_enable();
    >
    > Which will increment the variable atomically wrt the local CPU.

    I still think this patch is buggy. Perhaps I am wrong. Please look at

    http://marc.info/?l=linux-kernel&m=118417177818825

    there was no any reply.

    Oleg.

    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.kernel.org
    More majordomo info at http://vger.kernel.org/majordomo-info.html
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2007-07-14 19:17    [W:0.042 / U:3.096 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site