Commit bd1e22b8 authored by Andrew Morton's avatar Andrew Morton Committed by Linus Torvalds
Browse files

[PATCH] initialise total_memory() earlier 



Initialise total_memory earlier in boot.  Because if for some reason we run
page reclaim early in boot, we don't want total_memory to be zero when we use
it as a divisor.

And rename total_memory to vm_total_pages to avoid naming clashes with
architectures.

Cc: Yasunori Goto <y-goto@jp.fujitsu.com>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Martin Bligh <mbligh@google.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent e0a42726

include/linux/swap.h

+1 −0
Original line number Diff line number Diff line
@@ -185,6 +185,7 @@ extern unsigned long try_to_free_pages(struct zone **, gfp_t); 
extern unsigned long shrink_all_memory(unsigned long nr_pages);

extern int vm_swappiness;

extern int remove_mapping(struct address_space *mapping, struct page *page);

extern long vm_total_pages;



#ifdef CONFIG_NUMA

extern int zone_reclaim_mode;

mm/page_alloc.c

+3 −3
Original line number Diff line number Diff line
@@ -1725,9 +1725,9 @@ void __meminit build_all_zonelists(void) 
		stop_machine_run(__build_all_zonelists, NULL, NR_CPUS);

		/* cpuset refresh routine should be here */

	}



	printk("Built %i zonelists\n", num_online_nodes());



	vm_total_pages = nr_free_pagecache_pages();

	printk("Built %i zonelists.  Total pages: %ld\n",

			num_online_nodes(), vm_total_pages);

}



/*

mm/vmscan.c

+2 −3
Original line number Diff line number Diff line
@@ -110,7 +110,7 @@ struct shrinker { 
 * From 0 .. 100.  Higher means more swappy.

 */

int vm_swappiness = 60;

static long total_memory;

long vm_total_pages;	/* The total number of pages which the VM controls */



static LIST_HEAD(shrinker_list);

static DECLARE_RWSEM(shrinker_rwsem);
@@ -743,7 +743,7 @@ static void shrink_active_list(unsigned long nr_pages, struct zone *zone, 
		 * how much memory

		 * is mapped.

		 */

		mapped_ratio = (sc->nr_mapped * 100) / total_memory;

		mapped_ratio = (sc->nr_mapped * 100) / vm_total_pages;



		/*

		 * Now decide how much we really want to unmap some pages.  The
@@ -1482,7 +1482,6 @@ static int __init kswapd_init(void) 
		pgdat->kswapd = find_task_by_pid(pid);

		read_unlock(&tasklist_lock);

	}

	total_memory = nr_free_pagecache_pages();

	hotcpu_notifier(cpu_callback, 0);

	return 0;

}

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