[lkml]   [2012]   [Jun]   [5]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
    SubjectRe: [PATCH] perf: Fix intel shared extra msr allocation
    On Tue, 2012-06-05 at 14:07 +0200, Peter Zijlstra wrote:
    > On Tue, 2012-06-05 at 12:38 +0200, Stephane Eranian wrote:
    > > How about we add a field or flag to cpuc to tell it's fake, and then
    > > in
    > > try_alt_er() and __intel_shared_reg_get_constraints() we avoid
    > > touching
    > > live struct (like reg->alloc) if fake==1. I think he was trying to do
    > > the same with the core_id == -1 test.
    > We might have to do something like that, however I'm trying to figure
    > out when that reg->alloc test in __intel_shared_reg_get_contraints() is
    > useful.
    > If it is useful in event scheduling, we cannot just leave it out in
    > validate_group().

    OK, so x86_schedule_events() can call that multiple times on the same
    event in case we keep adding events.. it needs the constraints of the
    previous events as well, and in that case we skip the whole extra_reg

    But for validate_group() we only do this once, so it should work. Nasty

     \ /
      Last update: 2012-06-05 15:21    [W:0.021 / U:395.852 seconds]
    ©2003-2017 Jasper Spaans. hosted at Digital OceanAdvertise on this site