• Steven Rostedt's avatar
    sched_clock: record TSC after gtod · a83bc47c
    Steven Rostedt authored
    To read the gtod we need to grab the xtime lock for read. Reading the gtod
    before the TSC can cause a bigger gab if the xtime lock is contended.
    
    This patch simply reverses the order to read the TSC after the gtod.
    The locking in the reading of the gtod handles any barriers one might
    think is needed.
    Signed-off-by: default avatarSteven Rostedt <srostedt@redhat.com>
    Cc: Steven Rostedt <srostedt@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: john stultz <johnstul@us.ibm.com>
    Signed-off-by: default avatarIngo Molnar <mingo@elte.hu>
    a83bc47c
sched_clock.c 6.62 KB