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Commit 866e2611 authored by J. Bruce Fields's avatar J. Bruce Fields Committed by Thomas Gleixner
Browse files

timers: Document meaning of deferrable timer 



Steal some text from 6e453a67 "Add support for deferrable timers".  A
reader shouldn't have to dig through the git logs for the basic
description of a deferrable timer.

Signed-off-by: default avatarJ. Bruce Fields <bfields@citi.umich.edu>
Cc: johnstul@us.ibm.com
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarThomas Gleixner <tglx@linutronix.de>
parent b37fa16e

kernel/timer.c

+7 −2
Original line number Diff line number Diff line
@@ -90,8 +90,13 @@ static DEFINE_PER_CPU(struct tvec_base *, tvec_bases) = &boot_tvec_bases; 


/*

 * Note that all tvec_bases are 2 byte aligned and lower bit of

 * base in timer_list is guaranteed to be zero. Use the LSB for

 * the new flag to indicate whether the timer is deferrable

 * base in timer_list is guaranteed to be zero. Use the LSB to

 * indicate whether the timer is deferrable.

 *

 * A deferrable timer will work normally when the system is busy, but

 * will not cause a CPU to come out of idle just to service it; instead,

 * the timer will be serviced when the CPU eventually wakes up with a

 * subsequent non-deferrable timer.

 */

#define TBASE_DEFERRABLE_FLAG		(0x1)