path: root/net
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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-07-01 18:05:56 +0300
committerJ. Bruce Fields <bfields@citi.umich.edu>2010-07-06 12:27:48 -0400
commit8eab945c5616fc984e97b922d6a2559be93f39a1 (patch)
tree13ad5889aae1f8f3541a5a49e9decf42240e445c /net
parentcba9ba4b902270c22f8b9c5149a284216b633fc1 (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 'net')
2 files changed, 7 insertions, 1 deletions
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 58de76c8540..939d048ef92 100644
--- a/net/sunrpc/cache.c
+++ b/net/sunrpc/cache.c
@@ -320,7 +320,7 @@ static struct cache_detail *current_detail;
static int current_index;
static void do_cache_clean(struct work_struct *work);
-static DECLARE_DELAYED_WORK(cache_cleaner, do_cache_clean);
+static struct delayed_work cache_cleaner;
static void sunrpc_init_cache_detail(struct cache_detail *cd)
@@ -1504,6 +1504,11 @@ static int create_cache_proc_entries(struct cache_detail *cd)
+void __init cache_initialize(void)
+ INIT_DELAYED_WORK_DEFERRABLE(&cache_cleaner, do_cache_clean);
int cache_register(struct cache_detail *cd)
int ret;
diff --git a/net/sunrpc/sunrpc_syms.c b/net/sunrpc/sunrpc_syms.c
index f438347d817..c52b1848914 100644
--- a/net/sunrpc/sunrpc_syms.c
+++ b/net/sunrpc/sunrpc_syms.c
@@ -43,6 +43,7 @@ init_sunrpc(void)
+ cache_initialize();
svc_init_xprt_sock(); /* svc sock transport */