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lowmemorykiller: Account for ZONE_MOVABLE during hotplug.

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When a memory section is offlined, lmk would be invoked to
create room to migrate pages if required. When this happens
lmk should discount any free memory in the section being
offlined for its heuristics.

Change-Id: I79d8e332451cbb6d51735836b6a19bded01dfad9
Signed-off-by: Naveen Ramaraj <nramaraj@codeaurora.org>
This commit is contained in:
Naveen Ramaraj
2011-11-29 17:34:40 -08:00
parent 2c60124cfd
commit 371be5e487
1 changed files with 45 additions and 0 deletions
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drivers/staging/android/lowmemorykiller.c
+45
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@@ -35,6 +35,8 @@
#include <linux/oom.h>
#include <linux/sched.h>
#include <linux/notifier.h>
#include <linux/memory.h>
#include <linux/memory_hotplug.h>
static uint32_t lowmem_debug_level = 2;
static int lowmem_adj[6] = {
@@ -52,6 +54,7 @@ static size_t lowmem_minfree[6] = {
};
static int lowmem_minfree_size = 4;
static unsigned int offlining;
static struct task_struct *lowmem_deathpending;
static unsigned long lowmem_deathpending_timeout;
@@ -79,6 +82,32 @@ task_notify_func(struct notifier_block *self, unsigned long val, void *data)
return NOTIFY_OK;
}
#ifdef CONFIG_MEMORY_HOTPLUG
static int lmk_hotplug_callback(struct notifier_block *self,
unsigned long cmd, void *data)
{
switch (cmd) {
/* Don't care LMK cases */
case MEM_ONLINE:
case MEM_OFFLINE:
case MEM_CANCEL_ONLINE:
case MEM_CANCEL_OFFLINE:
case MEM_GOING_ONLINE:
offlining = 0;
lowmem_print(4, "lmk in normal mode\n");
break;
/* LMK should account for movable zone */
case MEM_GOING_OFFLINE:
offlining = 1;
lowmem_print(4, "lmk in hotplug mode\n");
break;
}
return NOTIFY_DONE;
}
#endif
static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
{
struct task_struct *p;
@@ -93,7 +122,20 @@ static int lowmem_shrink(struct shrinker *s, struct shrink_control *sc)
int other_free = global_page_state(NR_FREE_PAGES);
int other_file = global_page_state(NR_FILE_PAGES) -
global_page_state(NR_SHMEM);
struct zone *zone;
if (offlining) {
/* Discount all free space in the section being offlined */
for_each_zone(zone) {
if (zone_idx(zone) == ZONE_MOVABLE) {
other_free -= zone_page_state(zone,
NR_FREE_PAGES);
lowmem_print(4, "lowmem_shrink discounted "
"%lu pages in movable zone\n",
zone_page_state(zone, NR_FREE_PAGES));
}
}
}
/*
* If we already have a death outstanding, then
* bail out right away; indicating to vmscan
@@ -190,6 +232,9 @@ static int __init lowmem_init(void)
{
task_free_register(&task_nb);
register_shrinker(&lowmem_shrinker);
#ifdef CONFIG_MEMORY_HOTPLUG
hotplug_memory_notifier(lmk_hotplug_callback, 0);
#endif
return 0;
}