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tmpfs: move swap_state stats update

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Both unionfs and memcgroups pose challenges to tmpfs and shmem.  To help fix,
it's best to move the swap swizzling functions from swap_state.c to shmem.c.
As a preliminary to that, move swap stats updating down into
__add_to_swap_cache, which will remain internal to swap_state.c.

Well, actually, just move down the incrementation of add_total: remove
noent_race and exist_race completely, they are relics of my 2.4.11 testing.
Alt-SysRq-m users will be thrilled if 2.6.25 is at last free of "race M+N"s.

Signed-off-by: Hugh Dickins <hugh@veritas.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins 2008-02-04 22:28:49 -08:00 committed by Linus Torvalds
parent 818db35992
commit bb63be0a09
1 changed files with 6 additions and 16 deletions
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22
mm/swap_state.c
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@ -52,16 +52,13 @@ static struct {
unsigned long del_total;
unsigned long find_success;
unsigned long find_total;
unsigned long noent_race;
unsigned long exist_race;
} swap_cache_info;
void show_swap_cache_info(void)
{
printk("Swap cache: add %lu, delete %lu, find %lu/%lu, race %lu+%lu\n",
printk("Swap cache: add %lu, delete %lu, find %lu/%lu\n",
swap_cache_info.add_total, swap_cache_info.del_total,
swap_cache_info.find_success, swap_cache_info.find_total,
swap_cache_info.noent_race, swap_cache_info.exist_race);
swap_cache_info.find_success, swap_cache_info.find_total);
printk("Free swap = %lukB\n", nr_swap_pages << (PAGE_SHIFT - 10));
printk("Total swap = %lukB\n", total_swap_pages << (PAGE_SHIFT - 10));
}
@ -89,6 +86,7 @@ static int __add_to_swap_cache(struct page *page, swp_entry_t entry,
set_page_private(page, entry.val);
total_swapcache_pages++;
__inc_zone_page_state(page, NR_FILE_PAGES);
INC_CACHE_INFO(add_total);
}
write_unlock_irq(&swapper_space.tree_lock);
radix_tree_preload_end();
@ -102,10 +100,9 @@ static int add_to_swap_cache(struct page *page, swp_entry_t entry,
int error;
BUG_ON(PageLocked(page));
if (!swap_duplicate(entry)) {
INC_CACHE_INFO(noent_race);
if (!swap_duplicate(entry))
return -ENOENT;
}
SetPageLocked(page);
error = __add_to_swap_cache(page, entry, gfp_mask & GFP_KERNEL);
/*
@ -114,11 +111,8 @@ static int add_to_swap_cache(struct page *page, swp_entry_t entry,
if (error) {
ClearPageLocked(page);
swap_free(entry);
if (error == -EEXIST)
INC_CACHE_INFO(exist_race);
return error;
}
INC_CACHE_INFO(add_total);
return 0;
}
@ -178,11 +172,9 @@ int add_to_swap(struct page * page, gfp_t gfp_mask)
case 0: /* Success */
SetPageUptodate(page);
SetPageDirty(page);
INC_CACHE_INFO(add_total);
return 1;
case -EEXIST:
/* Raced with "speculative" read_swap_cache_async */
INC_CACHE_INFO(exist_race);
swap_free(entry);
continue;
default:
@ -225,9 +217,7 @@ int move_to_swap_cache(struct page *page, swp_entry_t entry)
if (!swap_duplicate(entry))
BUG();
SetPageDirty(page);
INC_CACHE_INFO(add_total);
} else if (err == -EEXIST)
INC_CACHE_INFO(exist_race);
}
return err;
}