The patch titled
timers.c: document meaning of deferrable timer
has been added to the -mm tree. Its filename is
timersc-document-meaning-of-deferrable-timer.patch
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------------------------------------------------------
Subject: timers.c: document meaning of deferrable timer
From: J. Bruce Fields <bfields@xxxxxxxxxxxxxx>
Steal some text from 6e453a67510 "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: J. Bruce Fields <bfields@xxxxxxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
kernel/timer.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
diff -puN kernel/timer.c~timersc-document-meaning-of-deferrable-timer kernel/timer.c
--- a/kernel/timer.c~timersc-document-meaning-of-deferrable-timer
+++ a/kernel/timer.c
@@ -90,8 +90,13 @@ static DEFINE_PER_CPU(struct tvec_base *
/*
* 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)
_
Patches currently in -mm which might be from bfields@xxxxxxxxxxxxxx are
linux-next.patch
timersc-document-meaning-of-deferrable-timer.patch
reiser4.patch
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