Merge "android: lowmemorykiller: disable ALMK during memory offline" (c2dce29f) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/staging/android/lowmemorykiller.c

+35 −3

Original line number	Diff line number	Diff line
		@@ -49,6 +49,7 @@
		#include <linux/cpuset.h>
		#include <linux/vmpressure.h>
		#include <linux/freezer.h>
		#include <linux/memory.h>

		#define CREATE_TRACE_POINTS
		#include <trace/events/almk.h>
		@@ -111,8 +112,14 @@ static atomic_t shift_adj = ATOMIC_INIT(0);
		static short adj_max_shift = 353;
		module_param_named(adj_max_shift, adj_max_shift, short, 0644);

		enum {
		ADAPTIVE_LMK_DISABLED = 0,
		ADAPTIVE_LMK_ENABLED,
		ADAPTIVE_LMK_WAS_ENABLED,
		};

		/* User knob to enable/disable adaptive lmk feature */
		static int enable_adaptive_lmk;
		static int enable_adaptive_lmk = ADAPTIVE_LMK_DISABLED;
		module_param_named(enable_adaptive_lmk, enable_adaptive_lmk, int, 0644);

		/*
		@@ -153,7 +160,7 @@ static int adjust_minadj(short *min_score_adj)
		{
		int ret = VMPRESSURE_NO_ADJUST;

		if (!enable_adaptive_lmk)
		if (enable_adaptive_lmk != ADAPTIVE_LMK_ENABLED)
		return 0;

		if (atomic_read(&shift_adj) &&
		@@ -176,7 +183,7 @@ static int lmk_vmpressure_notifier(struct notifier_block *nb,
		unsigned long pressure = action;
		int array_size = ARRAY_SIZE(lowmem_adj);

		if (!enable_adaptive_lmk)
		if (enable_adaptive_lmk != ADAPTIVE_LMK_ENABLED)
		return 0;

		if (pressure >= 95) {
		@@ -678,16 +685,41 @@ static unsigned long lowmem_scan(struct shrinker s, struct shrink_control sc)
		return rem;
		}

		static int lmk_hotplug_callback(struct notifier_block *self,
		unsigned long action, void *arg)
		{
		switch (action) {
		case MEM_GOING_OFFLINE:
		if (enable_adaptive_lmk == ADAPTIVE_LMK_ENABLED)
		enable_adaptive_lmk = ADAPTIVE_LMK_WAS_ENABLED;
		break;
		case MEM_OFFLINE:
		if (enable_adaptive_lmk == ADAPTIVE_LMK_WAS_ENABLED)
		enable_adaptive_lmk = ADAPTIVE_LMK_ENABLED;
		break;
		default:
		break;
		}
		return NOTIFY_OK;
		}

		static struct shrinker lowmem_shrinker = {
		.scan_objects = lowmem_scan,
		.count_objects = lowmem_count,
		.seeks = DEFAULT_SEEKS * 16
		};

		static struct notifier_block lmk_memory_callback_nb = {
		.notifier_call = lmk_hotplug_callback,
		.priority = 0,
		};

		static int __init lowmem_init(void)
		{
		register_shrinker(&lowmem_shrinker);
		vmpressure_notifier_register(&lmk_vmpr_nb);
		if (register_hotmemory_notifier(&lmk_memory_callback_nb))
		lowmem_print(1, "Registering memory hotplug notifier failed\n");
		return 0;
		}
		device_initcall(lowmem_init);