• Peter Zijlstra's avatar
    perf/x86: Ensure perf_sched_cb_{inc,dec}() is only called from pmu::{add,del}() · 68f7082f
    Peter Zijlstra authored
    Currently perf_sched_cb_{inc,dec}() are called from
    pmu::{start,stop}(), which has the problem that this can happen from
    NMI context, this is making it hard to optimize perf_pmu_sched_task().
    
    Furthermore, we really only need this accounting on pmu::{add,del}(),
    so doing it from pmu::{start,stop}() is doing more work than we really
    need.
    
    Introduce x86_pmu::{add,del}() and wire up the LBR and PEBS.
    Signed-off-by: default avatarPeter Zijlstra (Intel) <peterz@infradead.org>
    Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
    Cc: Arnaldo Carvalho de Melo <acme@redhat.com>
    Cc: Jiri Olsa <jolsa@redhat.com>
    Cc: Linus Torvalds <torvalds@linux-foundation.org>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Stephane Eranian <eranian@google.com>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Vince Weaver <vincent.weaver@maine.edu>
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: default avatarIngo Molnar <mingo@kernel.org>
    68f7082f
ds.c 38.8 KB