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Subject[PATCH v2 3/4] introduce zero-filled page stat count
Date
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>
---
drivers/staging/zcache/zcache-main.c | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)

diff --git a/drivers/staging/zcache/zcache-main.c b/drivers/staging/zcache/zcache-main.c
index db200b4..2091a4d 100644
--- a/drivers/staging/zcache/zcache-main.c
+++ b/drivers/staging/zcache/zcache-main.c
@@ -196,6 +196,7 @@ static ssize_t zcache_eph_nonactive_puts_ignored;
static ssize_t zcache_pers_nonactive_puts_ignored;
static ssize_t zcache_writtenback_pages;
static ssize_t zcache_outstanding_writeback_pages;
+static ssize_t zcache_pages_zero;

#ifdef CONFIG_DEBUG_FS
#include <linux/debugfs.h>
@@ -257,6 +258,7 @@ static int zcache_debugfs_init(void)
zdfs("outstanding_writeback_pages", S_IRUGO, root,
&zcache_outstanding_writeback_pages);
zdfs("writtenback_pages", S_IRUGO, root, &zcache_writtenback_pages);
+ zdfs("pages_zero", S_IRUGO, root, &zcache_pages_zero);
return 0;
}
#undef zdebugfs
@@ -326,6 +328,7 @@ void zcache_dump(void)
pr_info("zcache: outstanding_writeback_pages=%zd\n",
zcache_outstanding_writeback_pages);
pr_info("zcache: writtenback_pages=%zd\n", zcache_writtenback_pages);
+ pr_info("zcache: pages_zero=%zd\n", zcache_pages_zero);
}
#endif

@@ -562,6 +565,7 @@ static void *zcache_pampd_eph_create(char *data, size_t size, bool raw,
kunmap_atomic(user_mem);
clen = 0;
zero_filled = true;
+ zcache_pages_zero++;
goto got_pampd;
}
kunmap_atomic(user_mem);
@@ -645,6 +649,7 @@ static void *zcache_pampd_pers_create(char *data, size_t size, bool raw,
kunmap_atomic(user_mem);
clen = 0;
zero_filled = true;
+ zcache_pages_zero++;
goto got_pampd;
}
kunmap_atomic(user_mem);
@@ -866,6 +871,7 @@ static int zcache_pampd_get_data_and_free(char *data, size_t *sizep, bool raw,
zpages = 0;
if (!raw)
*sizep = PAGE_SIZE;
+ zcache_pages_zero--;
goto zero_fill;
}

@@ -922,6 +928,7 @@ static void zcache_pampd_free(void *pampd, struct tmem_pool *pool,
zero_filled = true;
zsize = 0;
zpages = 0;
+ zcache_pages_zero--;
}

if (pampd_is_remote(pampd) && !zero_filled) {
--
1.7.7.6


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