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Subject[PATCH] timers.c: document meaning of deferrable timer
From: J. Bruce Fields <bfields@citi.umich.edu>

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@citi.umich.edu>
---
kernel/timer.c | 9 +++++++--
1 files changed, 7 insertions(+), 2 deletions(-)

diff --git a/kernel/timer.c b/kernel/timer.c
index ee305c8..947bcf6 100644
--- a/kernel/timer.c
+++ b/kernel/timer.c
@@ -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)

--
1.7.0.4


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