• Sameer Nanda's avatar
    init: skip calibration delay if previously done · 7afe1845
    Sameer Nanda authored
    For each CPU, do the calibration delay only once.  For subsequent calls,
    use the cached per-CPU value of loops_per_jiffy.
    This saves about 200ms of resume time on dual core Intel Atom N5xx based
    systems.  This helps bring down the kernel resume time on such systems
    from about 500ms to about 300ms.
    [akpm@linux-foundation.org: make cpu_loops_per_jiffy static]
    [akpm@linux-foundation.org: clean up message text]
    [akpm@linux-foundation.org: fix things up after upstream rmk changes]
    Signed-off-by: default avatarSameer Nanda <snanda@chromium.org>
    Cc: Phil Carmody <ext-phil.2.carmody@nokia.com>
    Cc: Andrew Worsley <amworsley@gmail.com>
    Cc: David Daney <ddaney@caviumnetworks.com>
    Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
calibrate.c 7.9 KB