forked from Minki/linux
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>
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parent
90874fc21c
commit
834e3a1cea
drivers/staging/zcache
@ -35,6 +35,8 @@ ssize_t zcache_pers_ate_eph;
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ssize_t zcache_pers_ate_eph_failed;
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ssize_t zcache_evicted_eph_zpages;
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ssize_t zcache_evicted_eph_pageframes;
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ssize_t zcache_zero_filled_pages;
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ssize_t zcache_zero_filled_pages_max;
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#define ATTR(x) { .name = #x, .val = &zcache_##x, }
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static struct debug_entry {
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@ -62,6 +64,7 @@ static struct debug_entry {
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ATTR(last_inactive_anon_pageframes),
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ATTR(eph_nonactive_puts_ignored),
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ATTR(pers_nonactive_puts_ignored),
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ATTR(zero_filled_pages),
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#ifdef CONFIG_ZCACHE_WRITEBACK
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ATTR(outstanding_writeback_pages),
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ATTR(writtenback_pages),
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@ -122,6 +122,21 @@ static inline void dec_zcache_pers_zpages(unsigned zpages)
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zcache_pers_zpages = atomic_sub_return(zpages, &zcache_pers_zpages_atomic);
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}
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extern ssize_t zcache_zero_filled_pages;
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static atomic_t zcache_zero_filled_pages_atomic = ATOMIC_INIT(0);
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extern ssize_t zcache_zero_filled_pages_max;
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static inline void inc_zcache_zero_filled_pages(void)
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{
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zcache_zero_filled_pages = atomic_inc_return(
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&zcache_zero_filled_pages_atomic);
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if (zcache_zero_filled_pages > zcache_zero_filled_pages_max)
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zcache_zero_filled_pages_max = zcache_zero_filled_pages;
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}
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static inline void dec_zcache_zero_filled_pages(void)
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{
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zcache_zero_filled_pages = atomic_dec_return(
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&zcache_zero_filled_pages_atomic);
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}
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static inline unsigned long curr_pageframes_count(void)
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{
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return zcache_pageframes_alloced -
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@ -200,6 +215,8 @@ static inline void inc_zcache_eph_zpages(void) { };
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static inline void dec_zcache_eph_zpages(unsigned zpages) { };
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static inline void inc_zcache_pers_zpages(void) { };
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static inline void dec_zcache_pers_zpages(unsigned zpages) { };
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static inline void inc_zcache_zero_filled_pages(void) { };
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static inline void dec_zcache_zero_filled_pages(void) { };
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static inline unsigned long curr_pageframes_count(void)
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{
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return 0;
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@ -374,6 +374,7 @@ static void *zcache_pampd_eph_create(char *data, size_t size, bool raw,
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if (page_is_zero_filled(page)) {
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clen = 0;
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zero_filled = true;
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inc_zcache_zero_filled_pages();
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goto got_pampd;
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}
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@ -440,6 +441,7 @@ static void *zcache_pampd_pers_create(char *data, size_t size, bool raw,
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if (page_is_zero_filled(page)) {
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clen = 0;
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zero_filled = true;
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inc_zcache_zero_filled_pages();
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goto got_pampd;
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}
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@ -652,6 +654,7 @@ static int zcache_pampd_get_data_and_free(char *data, size_t *sizep, bool raw,
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zpages = 1;
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if (!raw)
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*sizep = PAGE_SIZE;
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dec_zcache_zero_filled_pages();
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goto zero_fill;
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}
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@ -702,6 +705,7 @@ static void zcache_pampd_free(void *pampd, struct tmem_pool *pool,
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zero_filled = true;
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zsize = 0;
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zpages = 1;
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dec_zcache_zero_filled_pages();
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}
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if (pampd_is_remote(pampd) && !zero_filled) {
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