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[PATCH] meminfo: add Cached underflow check 

Working on some code lately I've been getting huge values for "Cached".
The cause is that get_page_cache_size() is an approximate value, and for a
sufficiently small returned value of get_page_cache_size() the value
underflows.

Signed-off-by:  Martin Hicks <mort@sgi.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Martin Hicks 2005-04-16 15:24:08 -07:00 committed by Linus Torvalds
parent 76c3073a88
commit 4c4c402d6c
1 changed files with 6 additions and 1 deletions
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7
fs/proc/proc_misc.c
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@ -126,6 +126,7 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
unsigned long committed;
unsigned long allowed;
struct vmalloc_info vmi;
long cached;
get_page_state(&ps);
get_zone_counts(&active, &inactive, &free);
@ -140,6 +141,10 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
allowed = ((totalram_pages - hugetlb_total_pages())
* sysctl_overcommit_ratio / 100) + total_swap_pages;
cached = get_page_cache_size() - total_swapcache_pages - i.bufferram;
if (cached < 0)
cached = 0;
get_vmalloc_info(&vmi);
/*
@ -172,7 +177,7 @@ static int meminfo_read_proc(char *page, char **start, off_t off,
K(i.totalram),
K(i.freeram),
K(i.bufferram),
K(get_page_cache_size()-total_swapcache_pages-i.bufferram),
K(cached),
K(total_swapcache_pages),
K(active),
K(inactive),