Create a work on each online cpu, and schedule it in circles to reclaim page cache.
Signed-off-by: Xishi Qiu <[email protected]> --- mm/vmscan.c | 41 +++++++++++++++++++++++++++++++++++++++++ 1 files changed, 41 insertions(+), 0 deletions(-) diff --git a/mm/vmscan.c b/mm/vmscan.c index 61cedfc..d7f866e 100644 --- a/mm/vmscan.c +++ b/mm/vmscan.c @@ -140,6 +140,7 @@ unsigned long vm_cache_limit_mbytes_max; unsigned long vm_cache_reclaim_s __read_mostly; unsigned long vm_cache_reclaim_s_min; +static DEFINE_PER_CPU(struct delayed_work, vmscan_work); static LIST_HEAD(shrinker_list); static DECLARE_RWSEM(shrinker_rwsem); @@ -3384,8 +3385,23 @@ unsigned long shrink_all_memory(unsigned long nr_to_reclaim) } #endif /* CONFIG_HIBERNATION */ +static void shrink_page_cache_work(struct work_struct *w) +{ + struct delayed_work *work = to_delayed_work(w); + + if (vm_cache_reclaim_s == 0) { + schedule_delayed_work(work, round_jiffies_relative(120 * HZ)); + return; + } + + shrink_page_cache(GFP_KERNEL); + schedule_delayed_work(work, round_jiffies_relative(vm_cache_reclaim_s * HZ)); +} + static void shrink_page_cache_init(void) { + int cpu; + vm_cache_limit_ratio = 0; vm_cache_limit_ratio_min = 0; vm_cache_limit_ratio_max = 100; @@ -3394,6 +3410,13 @@ static void shrink_page_cache_init(void) vm_cache_limit_mbytes_max = totalram_pages; vm_cache_reclaim_s = 0; vm_cache_reclaim_s_min = 0; + + for_each_online_cpu(cpu) { + struct delayed_work *work = &per_cpu(vmscan_work, cpu); + INIT_DEFERRABLE_WORK(work, shrink_page_cache_work); + schedule_delayed_work_on(cpu, work, + __round_jiffies_relative(vm_cache_reclaim_s * HZ, cpu)); + } } static unsigned long __shrink_page_cache(gfp_t mask) @@ -3428,6 +3451,8 @@ static int cpu_callback(struct notifier_block *nfb, unsigned long action, void *hcpu) { int nid; + long cpu = (long)hcpu; + struct delayed_work *work = &per_cpu(vmscan_work, cpu); if (action == CPU_ONLINE || action == CPU_ONLINE_FROZEN) { for_each_node_state(nid, N_MEMORY) { @@ -3441,6 +3466,22 @@ static int cpu_callback(struct notifier_block *nfb, unsigned long action, set_cpus_allowed_ptr(pgdat->kswapd, mask); } } + + switch (action) { + case CPU_ONLINE: + if (work->work.func == NULL) + INIT_DEFERRABLE_WORK(work, shrink_page_cache_work); + schedule_delayed_work_on(cpu, work, + __round_jiffies_relative(vm_cache_reclaim_s * HZ, cpu)); + break; + case CPU_DOWN_PREPARE: + cancel_delayed_work_sync(work); + work->work.func = NULL; + break; + default: + break; + } + return NOTIFY_OK; } -- 1.6.0.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
