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staging: zcache: introduce zero-filled page stat count

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Introduce zero-filled page statistics to monitor the number of
zero-filled pages.

Acked-by: Dan Magenheimer <dan.magenheimer@oracle.com>
Signed-off-by: Wanpeng Li <liwanp@linux.vnet.ibm.com>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wanpeng Li 2013-04-03 18:16:22 +08:00 committed by Greg Kroah-Hartman
parent 90874fc21c
commit 834e3a1cea
3 changed files with 24 additions and 0 deletions
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3
drivers/staging/zcache/debug.c
View file

@ -35,6 +35,8 @@ ssize_t zcache_pers_ate_eph;
ssize_t zcache_pers_ate_eph_failed;
ssize_t zcache_evicted_eph_zpages;
ssize_t zcache_evicted_eph_pageframes;
ssize_t zcache_zero_filled_pages;
ssize_t zcache_zero_filled_pages_max;
#define ATTR(x) { .name = #x, .val = &zcache_##x, }
static struct debug_entry {
@ -62,6 +64,7 @@ static struct debug_entry {
ATTR(last_inactive_anon_pageframes),
ATTR(eph_nonactive_puts_ignored),
ATTR(pers_nonactive_puts_ignored),
ATTR(zero_filled_pages),
#ifdef CONFIG_ZCACHE_WRITEBACK
ATTR(outstanding_writeback_pages),
ATTR(writtenback_pages),

17
drivers/staging/zcache/debug.h
View file

@ -122,6 +122,21 @@ static inline void dec_zcache_pers_zpages(unsigned zpages)
zcache_pers_zpages = atomic_sub_return(zpages, &zcache_pers_zpages_atomic);
}
extern ssize_t zcache_zero_filled_pages;
static atomic_t zcache_zero_filled_pages_atomic = ATOMIC_INIT(0);
extern ssize_t zcache_zero_filled_pages_max;
static inline void inc_zcache_zero_filled_pages(void)
{
zcache_zero_filled_pages = atomic_inc_return(
&zcache_zero_filled_pages_atomic);
if (zcache_zero_filled_pages > zcache_zero_filled_pages_max)
zcache_zero_filled_pages_max = zcache_zero_filled_pages;
}
static inline void dec_zcache_zero_filled_pages(void)
{
zcache_zero_filled_pages = atomic_dec_return(
&zcache_zero_filled_pages_atomic);
}
static inline unsigned long curr_pageframes_count(void)
{
return zcache_pageframes_alloced -
@ -200,6 +215,8 @@ static inline void inc_zcache_eph_zpages(void) { };
static inline void dec_zcache_eph_zpages(unsigned zpages) { };
static inline void inc_zcache_pers_zpages(void) { };
static inline void dec_zcache_pers_zpages(unsigned zpages) { };
static inline void inc_zcache_zero_filled_pages(void) { };
static inline void dec_zcache_zero_filled_pages(void) { };
static inline unsigned long curr_pageframes_count(void)
{
return 0;

4
drivers/staging/zcache/zcache-main.c
View file

@ -374,6 +374,7 @@ static void *zcache_pampd_eph_create(char *data, size_t size, bool raw,
if (page_is_zero_filled(page)) {
clen = 0;
zero_filled = true;
inc_zcache_zero_filled_pages();
goto got_pampd;
}
@ -440,6 +441,7 @@ static void *zcache_pampd_pers_create(char *data, size_t size, bool raw,
if (page_is_zero_filled(page)) {
clen = 0;
zero_filled = true;
inc_zcache_zero_filled_pages();
goto got_pampd;
}
@ -652,6 +654,7 @@ static int zcache_pampd_get_data_and_free(char *data, size_t *sizep, bool raw,
zpages = 1;
if (!raw)
*sizep = PAGE_SIZE;
dec_zcache_zero_filled_pages();
goto zero_fill;
}
@ -702,6 +705,7 @@ static void zcache_pampd_free(void *pampd, struct tmem_pool *pool,
zero_filled = true;
zsize = 0;
zpages = 1;
dec_zcache_zero_filled_pages();
}
if (pampd_is_remote(pampd) && !zero_filled) {