diff options
| author | Arnd Bergmann <arnd@arndb.de> | 2011-10-20 15:17:34 +0200 |
|---|---|---|
| committer | Arnd Bergmann <arnd@arndb.de> | 2011-10-20 15:17:34 +0200 |
| commit | a32750c2ca6f697903b19063fc86f4272865e3a1 (patch) | |
| tree | 57a23806c5358855eb426c006c88943afa683b1b /mm/memcontrol.c | |
| parent | 318007e9001349db9b4fcd49e9e79a7636dba7a9 (diff) | |
| parent | d870ea1d6bc5057f2599416655b42ab192dae6d0 (diff) | |
| download | talos-op-linux-a32750c2ca6f697903b19063fc86f4272865e3a1.tar.gz talos-op-linux-a32750c2ca6f697903b19063fc86f4272865e3a1.zip | |
Merge branches 'imx/pata' and 'imx/sata' into next/driver
Conflicts:
arch/arm/mach-mx5/clock-mx51-mx53.c
arch/arm/mach-mx5/devices-imx53.h
Diffstat (limited to 'mm/memcontrol.c')
| -rw-r--r-- | mm/memcontrol.c | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index f4ec4e7ca4cd..930de9437271 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -2091,6 +2091,7 @@ struct memcg_stock_pcp { #define FLUSHING_CACHED_CHARGE (0) }; static DEFINE_PER_CPU(struct memcg_stock_pcp, memcg_stock); +static DEFINE_MUTEX(percpu_charge_mutex); /* * Try to consume stocked charge on this cpu. If success, one page is consumed @@ -2197,8 +2198,7 @@ static void drain_all_stock(struct mem_cgroup *root_mem, bool sync) for_each_online_cpu(cpu) { struct memcg_stock_pcp *stock = &per_cpu(memcg_stock, cpu); - if (mem_cgroup_same_or_subtree(root_mem, stock->cached) && - test_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) + if (test_bit(FLUSHING_CACHED_CHARGE, &stock->flags)) flush_work(&stock->work); } out: @@ -2213,14 +2213,22 @@ out: */ static void drain_all_stock_async(struct mem_cgroup *root_mem) { + /* + * If someone calls draining, avoid adding more kworker runs. + */ + if (!mutex_trylock(&percpu_charge_mutex)) + return; drain_all_stock(root_mem, false); + mutex_unlock(&percpu_charge_mutex); } /* This is a synchronous drain interface. */ static void drain_all_stock_sync(struct mem_cgroup *root_mem) { /* called when force_empty is called */ + mutex_lock(&percpu_charge_mutex); drain_all_stock(root_mem, true); + mutex_unlock(&percpu_charge_mutex); } /* |
