diff options
| author | Artem Bityutskiy <Artem.Bityutskiy@nokia.com> | 2010-07-01 18:05:56 +0300 |
|---|---|---|
| committer | J. Bruce Fields <bfields@citi.umich.edu> | 2010-07-06 12:27:48 -0400 |
| commit | 8eab945c5616fc984e97b922d6a2559be93f39a1 (patch) | |
| tree | 13ad5889aae1f8f3541a5a49e9decf42240e445c /include/linux/sunrpc/cache.h | |
| parent | cba9ba4b902270c22f8b9c5149a284216b633fc1 (diff) | |
sunrpc: make the cache cleaner workqueue deferrable
This patch makes the cache_cleaner workqueue deferrable, to prevent
unnecessary system wake-ups, which is very important for embedded
battery-powered devices.
do_cache_clean() is called every 30 seconds at the moment, and often
makes the system wake up from its power-save sleep state. With this
change, when the workqueue uses a deferrable timer, the
do_cache_clean() invocation will be delayed and combined with the
closest "real" wake-up. This improves the power consumption situation.
Note, I tried to create a DECLARE_DELAYED_WORK_DEFERRABLE() helper
macro, similar to DECLARE_DELAYED_WORK(), but failed because of the
way the timer wheel core stores the deferrable flag (it is the
LSBit in the time->base pointer). My attempt to define a static
variable with this bit set ended up with the "initializer element is
not constant" error.
Thus, I have to use run-time initialization, so I created a new
cache_initialize() function which is called once when sunrpc is
being initialized.
Signed-off-by: Artem Bityutskiy <Artem.Bityutskiy@nokia.com>
Signed-off-by: J. Bruce Fields <bfields@citi.umich.edu>
Diffstat (limited to 'include/linux/sunrpc/cache.h')
| -rw-r--r-- | include/linux/sunrpc/cache.h | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h index 6f52b4d7c44..7bf3e84b92f 100644 --- a/include/linux/sunrpc/cache.h +++ b/include/linux/sunrpc/cache.h @@ -192,6 +192,7 @@ extern int cache_check(struct cache_detail *detail, extern void cache_flush(void); extern void cache_purge(struct cache_detail *detail); #define NEVER (0x7FFFFFFF) +extern void __init cache_initialize(void); extern int cache_register(struct cache_detail *cd); extern void cache_unregister(struct cache_detail *cd); |