• Daniel Bristot de Oliveira's avatar
    trace/hwlat: Implement the mode config option · 8fa826b7
    Daniel Bristot de Oliveira authored
    Provides the "mode" config to the hardware latency detector. hwlatd has
    two different operation modes. The default mode is the "round-robin" one,
    in which a single hwlatd thread runs, migrating among the allowed CPUs in a
    "round-robin" fashion. This is the current behavior.
    
    The "none" sets the allowed cpumask for a single hwlatd thread at the
    startup, but skips the round-robin, letting the scheduler handle the
    migration.
    
    In preparation to the per-cpu mode.
    
    Link: https://lkml.kernel.org/r/f3b1271262aa030c680e26615c1b9b2d71e55e92.1624372313.git.bristot@redhat.com
    
    Cc: Phil Auld <pauld@redhat.com>
    Cc: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
    Cc: Kate Carcia <kcarcia@redhat.com>
    Cc: Jonathan Corbet <corbet@lwn.net>
    Cc: Ingo Molnar <mingo@redhat.com>
    Cc: Peter Zijlstra <peterz@infradead.org>
    Cc: Thomas Gleixner <tglx@linutronix.de>
    Cc: Alexandre Chartre <alexandre.chartre@oracle.com>
    Cc: Clark Willaims <williams@redhat.com>
    Cc: John Kacur <jkacur@redhat.com>
    Cc: Juri Lelli <juri.lelli@redhat.com>
    Cc: Borislav Petkov <bp@alien8.de>
    Cc: "H. Peter Anvin" <hpa@zytor.com>
    Cc: x86@kernel.org
    Cc: linux-doc@vger.kernel.org
    Cc: linux-kernel@vger.kernel.org
    Signed-off-by: default avatarDaniel Bristot de Oliveira <bristot@redhat.com>
    Signed-off-by: default avatarSteven Rostedt (VMware) <rostedt@goodmis.org>
    8fa826b7
hwlat_detector.rst 3.98 KB