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authorArtem Bityutskiy <Artem.Bityutskiy@nokia.com>2010-07-01 19:05:56 +0400
committerJ. Bruce Fields <bfields@citi.umich.edu>2010-07-06 20:27:48 +0400
commit8eab945c5616fc984e97b922d6a2559be93f39a1 (patch)
tree13ad5889aae1f8f3541a5a49e9decf42240e445c
parentcba9ba4b902270c22f8b9c5149a284216b633fc1 (diff)
downloadlinux-8eab945c5616fc984e97b922d6a2559be93f39a1.tar.xz
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>
-rw-r--r--include/linux/sunrpc/cache.h1
-rw-r--r--net/sunrpc/cache.c7
-rw-r--r--net/sunrpc/sunrpc_syms.c1
3 files changed, 8 insertions, 1 deletions
diff --git a/include/linux/sunrpc/cache.h b/include/linux/sunrpc/cache.h
index 6f52b4d7c447..7bf3e84b92f4 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);
diff --git a/net/sunrpc/cache.c b/net/sunrpc/cache.c
index 58de76c8540c..939d048ef92b 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)
}
#endif
+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 f438347d817b..c52b18489149 100644
--- a/net/sunrpc/sunrpc_syms.c
+++ b/net/sunrpc/sunrpc_syms.c
@@ -43,6 +43,7 @@ init_sunrpc(void)
#ifdef CONFIG_PROC_FS
rpc_proc_init();
#endif
+ cache_initialize();
cache_register(&ip_map_cache);
cache_register(&unix_gid_cache);
svc_init_xprt_sock(); /* svc sock transport */