linux-stable/include/linux/quicklist.h
KOSAKI Motohiro 4b8561521d mm: show quicklist usage in /proc/meminfo
Quicklists can consume several GB of memory.  We should provide a means of
monitoring this.

After this patch is applied, /proc/meminfo will output the following:

% cat /proc/meminfo

MemTotal:      7715392 kB
MemFree:       5401600 kB
Buffers:         80384 kB
Cached:         300800 kB
SwapCached:          0 kB
Active:         235584 kB
Inactive:       262656 kB
SwapTotal:     2031488 kB
SwapFree:      2031488 kB
Dirty:            3520 kB
Writeback:           0 kB
AnonPages:      117696 kB
Mapped:          38528 kB
Slab:          1589952 kB
SReclaimable:    23104 kB
SUnreclaim:    1566848 kB
PageTables:      14656 kB
NFS_Unstable:        0 kB
Bounce:              0 kB
WritebackTmp:        0 kB
CommitLimit:   5889152 kB
Committed_AS:   393152 kB
VmallocTotal: 17592177655808 kB
VmallocUsed:     29056 kB
VmallocChunk: 17592177626432 kB
Quicklists:     130944 kB
HugePages_Total:     0
HugePages_Free:      0
HugePages_Rsvd:      0
HugePages_Surp:      0
Hugepagesize:    262144 kB

Signed-off-by: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Cc: Christoph Lameter <cl@linux-foundation.org>
Cc: Keiichiro Tokunaga <tokunaga.keiich@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2008-09-02 19:21:38 -07:00

93 lines
2.1 KiB
C

#ifndef LINUX_QUICKLIST_H
#define LINUX_QUICKLIST_H
/*
* Fast allocations and disposal of pages. Pages must be in the condition
* as needed after allocation when they are freed. Per cpu lists of pages
* are kept that only contain node local pages.
*
* (C) 2007, SGI. Christoph Lameter <clameter@sgi.com>
*/
#include <linux/kernel.h>
#include <linux/gfp.h>
#include <linux/percpu.h>
#ifdef CONFIG_QUICKLIST
struct quicklist {
void *page;
int nr_pages;
};
DECLARE_PER_CPU(struct quicklist, quicklist)[CONFIG_NR_QUICK];
/*
* The two key functions quicklist_alloc and quicklist_free are inline so
* that they may be custom compiled for the platform.
* Specifying a NULL ctor can remove constructor support. Specifying
* a constant quicklist allows the determination of the exact address
* in the per cpu area.
*
* The fast patch in quicklist_alloc touched only a per cpu cacheline and
* the first cacheline of the page itself. There is minmal overhead involved.
*/
static inline void *quicklist_alloc(int nr, gfp_t flags, void (*ctor)(void *))
{
struct quicklist *q;
void **p = NULL;
q =&get_cpu_var(quicklist)[nr];
p = q->page;
if (likely(p)) {
q->page = p[0];
p[0] = NULL;
q->nr_pages--;
}
put_cpu_var(quicklist);
if (likely(p))
return p;
p = (void *)__get_free_page(flags | __GFP_ZERO);
if (ctor && p)
ctor(p);
return p;
}
static inline void __quicklist_free(int nr, void (*dtor)(void *), void *p,
struct page *page)
{
struct quicklist *q;
q = &get_cpu_var(quicklist)[nr];
*(void **)p = q->page;
q->page = p;
q->nr_pages++;
put_cpu_var(quicklist);
}
static inline void quicklist_free(int nr, void (*dtor)(void *), void *pp)
{
__quicklist_free(nr, dtor, pp, virt_to_page(pp));
}
static inline void quicklist_free_page(int nr, void (*dtor)(void *),
struct page *page)
{
__quicklist_free(nr, dtor, page_address(page), page);
}
void quicklist_trim(int nr, void (*dtor)(void *),
unsigned long min_pages, unsigned long max_free);
unsigned long quicklist_total_size(void);
#else
static inline unsigned long quicklist_total_size(void)
{
return 0;
}
#endif
#endif /* LINUX_QUICKLIST_H */