diff options
| author | Wanpeng Li <liwanp@linux.vnet.ibm.com> | 2013-04-03 18:16:22 +0800 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-04-03 13:38:37 -0700 |
| commit | 834e3a1cead22c40ad55dad9cd683e42396d45c1 (patch) | |
| tree | 8fe408554bd84a86099ae5a998ea9b844cf053e1 /drivers/staging/zcache | |
| parent | 90874fc21ca6ca46058c5039fe78a4155d9a631e (diff) | |
staging: zcache: introduce zero-filled page stat count
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>
Diffstat (limited to 'drivers/staging/zcache')
| -rw-r--r-- | drivers/staging/zcache/debug.c | 3 | ||||
| -rw-r--r-- | drivers/staging/zcache/debug.h | 17 | ||||
| -rw-r--r-- | drivers/staging/zcache/zcache-main.c | 4 |
3 files changed, 24 insertions, 0 deletions
diff --git a/drivers/staging/zcache/debug.c b/drivers/staging/zcache/debug.c index faab2a9b231..daa26919b88 100644 --- a/drivers/staging/zcache/debug.c +++ b/drivers/staging/zcache/debug.c @@ -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), diff --git a/drivers/staging/zcache/debug.h b/drivers/staging/zcache/debug.h index 8ec82d42cf2..ddad92fe9b0 100644 --- a/drivers/staging/zcache/debug.h +++ b/drivers/staging/zcache/debug.h @@ -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; diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c index 1994cab6edf..f3de76d0707 100644 --- a/drivers/staging/zcache/zcache-main.c +++ b/drivers/staging/zcache/zcache-main.c @@ -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) { |