On Wed, Apr 3, 2013 at 6:16 AM, Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx> wrote:
> Introduce zero-filled page statistics to monitor the number of
> zero-filled pages.
>
> Acked-by: Dan Magenheimer <dan.magenheimer@xxxxxxxxxx>
> Signed-off-by: Wanpeng Li <liwanp@xxxxxxxxxxxxxxxxxx>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
> ---
> drivers/staging/zcache/debug.c | 3 +++
> drivers/staging/zcache/debug.h | 17 +++++++++++++++++
> 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 faab2a9..daa2691 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 8ec82d4..ddad92f 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 1994cab..f3de76d 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) {
> --
> 1.7.5.4
>
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