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Commit c034ef70 authored by Arve Hjønnevåg's avatar Arve Hjønnevåg Committed by Ruchi Kandoi
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staging: android: lowmemorykiller: Add config option to support oom_adj values 



The conversion to use oom_score_adj instead of the deprecated oom_adj
values breaks existing user-space code. Add a config option to convert
oom_adj values written to oom_score_adj values if they appear to be
valid oom_adj values.

Change-Id: I68308125059b802ee2991feefb07e9703bc48549
Signed-off-by: default avatarArve Hjønnevåg <arve@android.com>
parent ec0ab3fc

drivers/staging/android/Kconfig

+9 −0
Original line number Diff line number Diff line
@@ -75,6 +75,15 @@ config ANDROID_LOW_MEMORY_KILLER 
	---help---

	  Registers processes to be killed when memory is low



config ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES

	bool "Android Low Memory Killer: detect oom_adj values"

	depends on ANDROID_LOW_MEMORY_KILLER

	default y

	---help---

	  Detect oom_adj values written to

	  /sys/module/lowmemorykiller/parameters/adj and convert them

	  to oom_score_adj values.



config ANDROID_INTF_ALARM_DEV

	tristate "Android alarm driver"

	depends on RTC_CLASS

drivers/staging/android/lowmemorykiller.c

+85 −0
Original line number Diff line number Diff line
@@ -187,9 +187,94 @@ static void __exit lowmem_exit(void) 
	unregister_shrinker(&lowmem_shrinker);

}



#ifdef CONFIG_ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES

static short lowmem_oom_adj_to_oom_score_adj(short oom_adj)

{

	if (oom_adj == OOM_ADJUST_MAX)

		return OOM_SCORE_ADJ_MAX;

	else

		return (oom_adj * OOM_SCORE_ADJ_MAX) / -OOM_DISABLE;

}



static void lowmem_autodetect_oom_adj_values(void)

{

	int i;

	short oom_adj;

	short oom_score_adj;

	int array_size = ARRAY_SIZE(lowmem_adj);



	if (lowmem_adj_size < array_size)

		array_size = lowmem_adj_size;



	if (array_size <= 0)

		return;



	oom_adj = lowmem_adj[array_size - 1];

	if (oom_adj > OOM_ADJUST_MAX)

		return;



	oom_score_adj = lowmem_oom_adj_to_oom_score_adj(oom_adj);

	if (oom_score_adj <= OOM_ADJUST_MAX)

		return;



	lowmem_print(1, "lowmem_shrink: convert oom_adj to oom_score_adj:\n");

	for (i = 0; i < array_size; i++) {

		oom_adj = lowmem_adj[i];

		oom_score_adj = lowmem_oom_adj_to_oom_score_adj(oom_adj);

		lowmem_adj[i] = oom_score_adj;

		lowmem_print(1, "oom_adj %d => oom_score_adj %d\n",

			     oom_adj, oom_score_adj);

	}

}



static int lowmem_adj_array_set(const char *val, const struct kernel_param *kp)

{

	int ret;



	ret = param_array_ops.set(val, kp);



	/* HACK: Autodetect oom_adj values in lowmem_adj array */

	lowmem_autodetect_oom_adj_values();



	return ret;

}



static int lowmem_adj_array_get(char *buffer, const struct kernel_param *kp)

{

	return param_array_ops.get(buffer, kp);

}



static void lowmem_adj_array_free(void *arg)

{

	param_array_ops.free(arg);

}



static struct kernel_param_ops lowmem_adj_array_ops = {

	.set = lowmem_adj_array_set,

	.get = lowmem_adj_array_get,

	.free = lowmem_adj_array_free,

};



static const struct kparam_array __param_arr_adj = {

	.max = ARRAY_SIZE(lowmem_adj),

	.num = &lowmem_adj_size,

	.ops = &param_ops_short,

	.elemsize = sizeof(lowmem_adj[0]),

	.elem = lowmem_adj,

};

#endif



module_param_named(cost, lowmem_shrinker.seeks, int, S_IRUGO | S_IWUSR);

#ifdef CONFIG_ANDROID_LOW_MEMORY_KILLER_AUTODETECT_OOM_ADJ_VALUES

__module_param_call(MODULE_PARAM_PREFIX, adj,

		    &lowmem_adj_array_ops,

		    .arr = &__param_arr_adj,

		    S_IRUGO | S_IWUSR, -1);

__MODULE_PARM_TYPE(adj, "array of short");

#else

module_param_array_named(adj, lowmem_adj, short, &lowmem_adj_size,

			 S_IRUGO | S_IWUSR);

#endif

module_param_array_named(minfree, lowmem_minfree, uint, &lowmem_minfree_size,

			 S_IRUGO | S_IWUSR);

module_param_named(debug_level, lowmem_debug_level, uint, S_IRUGO | S_IWUSR);