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Commit 0f551af8 authored by Vinayak Menon's avatar Vinayak Menon Committed by Gerrit - the friendly Code Review server
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lowmemorykiller: add zcache awareness 



zcache stores compressed file pages which should be
considered as reclaimable pages by lowmemorykiller
in calculating values to be compared against minfree.

Change-Id: Ia3e08bc14ba61c0a45ed54ba5cd525717a572060
Signed-off-by: default avatarVinayak Menon <vinmenon@codeaurora.org>
parent 8028892c

drivers/staging/android/lowmemorykiller.c

+7 −4
Original line number Diff line number Diff line
@@ -46,6 +46,7 @@ 
#include <linux/fs.h>

#include <linux/cpuset.h>

#include <linux/vmpressure.h>

#include <linux/zcache.h>



#define CREATE_TRACE_POINTS

#include <trace/events/almk.h>
@@ -146,7 +147,7 @@ static int lmk_vmpressure_notifier(struct notifier_block *nb, 
		return 0;



	if (pressure >= 95) {

		other_file = global_page_state(NR_FILE_PAGES) -

		other_file = global_page_state(NR_FILE_PAGES) + zcache_pages() -

			global_page_state(NR_SHMEM) -

			total_swapcache_pages();

		other_free = global_page_state(NR_FREE_PAGES);
@@ -159,7 +160,7 @@ static int lmk_vmpressure_notifier(struct notifier_block *nb, 
		if (lowmem_minfree_size < array_size)

			array_size = lowmem_minfree_size;



		other_file = global_page_state(NR_FILE_PAGES) -

		other_file = global_page_state(NR_FILE_PAGES) + zcache_pages() -

			global_page_state(NR_SHMEM) -

			total_swapcache_pages();
@@ -398,8 +399,8 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc) 
	other_free = global_page_state(NR_FREE_PAGES);



	if (global_page_state(NR_SHMEM) + total_swapcache_pages() <

		global_page_state(NR_FILE_PAGES))

		other_file = global_page_state(NR_FILE_PAGES) -

		global_page_state(NR_FILE_PAGES) + zcache_pages())

		other_file = global_page_state(NR_FILE_PAGES) + zcache_pages() -

						global_page_state(NR_SHMEM) -

						total_swapcache_pages();

	else
@@ -492,6 +493,7 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc) 
				"   Total reserve is %ldkB\n" \

				"   Total free pages is %ldkB\n" \

				"   Total file cache is %ldkB\n" \

				"   Total zcache is %ldkB\n" \

				"   GFP mask is 0x%x\n",

			     selected->comm, selected->pid,

			     selected_oom_score_adj,
@@ -508,6 +510,7 @@ static unsigned long lowmem_scan(struct shrinker *s, struct shrink_control *sc) 
				(long)(PAGE_SIZE / 1024),

			     global_page_state(NR_FILE_PAGES) *

				(long)(PAGE_SIZE / 1024),

			     (long)zcache_pages() * (long)(PAGE_SIZE / 1024),

			     sc->gfp_mask);



		if (lowmem_debug_level >= 2 && selected_oom_score_adj == 0) {

include/linux/zcache.h

0 → 100644
+22 −0
Original line number Diff line number Diff line 
/*

 * Copyright (c) 2015, The Linux Foundation. All rights reserved.

 *

 * This program is free software; you can redistribute it and/or modify

 * it under the terms of the GNU General Public License version 2 and

 * only version 2 as published by the Free Software Foundation.

 *

 * This program is distributed in the hope that it will be useful,

 * but WITHOUT ANY WARRANTY; without even the implied warranty of

 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the

 * GNU General Public License for more details.

 */

#ifndef _LINUX_ZCACHE_H

#define _LINUX_ZCACHE_H



#ifdef CONFIG_ZCACHE

extern u64 zcache_pages(void);

#else

u64 zcache_pages(void) { return 0; }

#endif



#endif /* _LINUX_ZCACHE_H */

mm/zcache.c

+5 −0
Original line number Diff line number Diff line
@@ -138,6 +138,11 @@ struct zcache_ra_handle { 
	struct zcache_pool *zpool;	/* Finding zcache_pool during evict */

};



u64 zcache_pages(void)

{

	return zcache_pool_pages;

}



static struct kmem_cache *zcache_rbnode_cache;

static int zcache_rbnode_cache_create(void)

{