diff options
| -rw-r--r-- | Documentation/ABI/testing/sysfs-kernel-slab | 109 | ||||
| -rw-r--r-- | mm/slub.c | 18 |
2 files changed, 75 insertions, 52 deletions
diff --git a/Documentation/ABI/testing/sysfs-kernel-slab b/Documentation/ABI/testing/sysfs-kernel-slab index 6dcf75e594fb..8b093f8222d3 100644 --- a/Documentation/ABI/testing/sysfs-kernel-slab +++ b/Documentation/ABI/testing/sysfs-kernel-slab @@ -45,8 +45,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The alloc_fastpath file is read-only and specifies how many - objects have been allocated using the fast path. + The alloc_fastpath file shows how many objects have been + allocated using the fast path. It can be written to clear the + current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/alloc_from_partial @@ -55,9 +56,10 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The alloc_from_partial file is read-only and specifies how - many times a cpu slab has been full and it has been refilled - by using a slab from the list of partially used slabs. + The alloc_from_partial file shows how many times a cpu slab has + been full and it has been refilled by using a slab from the list + of partially used slabs. It can be written to clear the current + count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/alloc_refill @@ -66,9 +68,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The alloc_refill file is read-only and specifies how many - times the per-cpu freelist was empty but there were objects - available as the result of remote cpu frees. + The alloc_refill file shows how many times the per-cpu freelist + was empty but there were objects available as the result of + remote cpu frees. It can be written to clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/alloc_slab @@ -77,8 +79,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The alloc_slab file is read-only and specifies how many times - a new slab had to be allocated from the page allocator. + The alloc_slab file is shows how many times a new slab had to + be allocated from the page allocator. It can be written to + clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/alloc_slowpath @@ -87,9 +90,10 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The alloc_slowpath file is read-only and specifies how many - objects have been allocated using the slow path because of a - refill or allocation from a partial or new slab. + The alloc_slowpath file shows how many objects have been + allocated using the slow path because of a refill or + allocation from a partial or new slab. It can be written to + clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/cache_dma @@ -117,10 +121,11 @@ KernelVersion: 2.6.31 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The file cpuslab_flush is read-only and specifies how many - times a cache's cpu slabs have been flushed as the result of - destroying or shrinking a cache, a cpu going offline, or as - the result of forcing an allocation from a certain node. + The file cpuslab_flush shows how many times a cache's cpu slabs + have been flushed as the result of destroying or shrinking a + cache, a cpu going offline, or as the result of forcing an + allocation from a certain node. It can be written to clear the + current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/ctor @@ -139,8 +144,8 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The file deactivate_empty is read-only and specifies how many - times an empty cpu slab was deactivated. + The deactivate_empty file shows how many times an empty cpu slab + was deactivated. It can be written to clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/deactivate_full @@ -149,8 +154,8 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The file deactivate_full is read-only and specifies how many - times a full cpu slab was deactivated. + The deactivate_full file shows how many times a full cpu slab + was deactivated. It can be written to clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/deactivate_remote_frees @@ -159,9 +164,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The file deactivate_remote_frees is read-only and specifies how - many times a cpu slab has been deactivated and contained free - objects that were freed remotely. + The deactivate_remote_frees file shows how many times a cpu slab + has been deactivated and contained free objects that were freed + remotely. It can be written to clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/deactivate_to_head @@ -170,9 +175,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The file deactivate_to_head is read-only and specifies how - many times a partial cpu slab was deactivated and added to the - head of its node's partial list. + The deactivate_to_head file shows how many times a partial cpu + slab was deactivated and added to the head of its node's partial + list. It can be written to clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/deactivate_to_tail @@ -181,9 +186,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The file deactivate_to_tail is read-only and specifies how - many times a partial cpu slab was deactivated and added to the - tail of its node's partial list. + The deactivate_to_tail file shows how many times a partial cpu + slab was deactivated and added to the tail of its node's partial + list. It can be written to clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/destroy_by_rcu @@ -201,9 +206,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The file free_add_partial is read-only and specifies how many - times an object has been freed in a full slab so that it had to - added to its node's partial list. + The free_add_partial file shows how many times an object has + been freed in a full slab so that it had to added to its node's + partial list. It can be written to clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/free_calls @@ -222,9 +227,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The free_fastpath file is read-only and specifies how many - objects have been freed using the fast path because it was an - object from the cpu slab. + The free_fastpath file shows how many objects have been freed + using the fast path because it was an object from the cpu slab. + It can be written to clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/free_frozen @@ -233,9 +238,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The free_frozen file is read-only and specifies how many - objects have been freed to a frozen slab (i.e. a remote cpu - slab). + The free_frozen file shows how many objects have been freed to + a frozen slab (i.e. a remote cpu slab). It can be written to + clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/free_remove_partial @@ -244,9 +249,10 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The file free_remove_partial is read-only and specifies how - many times an object has been freed to a now-empty slab so - that it had to be removed from its node's partial list. + The free_remove_partial file shows how many times an object has + been freed to a now-empty slab so that it had to be removed from + its node's partial list. It can be written to clear the current + count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/free_slab @@ -255,8 +261,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The free_slab file is read-only and specifies how many times an - empty slab has been freed back to the page allocator. + The free_slab file shows how many times an empty slab has been + freed back to the page allocator. It can be written to clear + the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/free_slowpath @@ -265,9 +272,9 @@ KernelVersion: 2.6.25 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The free_slowpath file is read-only and specifies how many - objects have been freed using the slow path (i.e. to a full or - partial slab). + The free_slowpath file shows how many objects have been freed + using the slow path (i.e. to a full or partial slab). It can + be written to clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/hwcache_align @@ -346,10 +353,10 @@ KernelVersion: 2.6.26 Contact: Pekka Enberg <penberg@cs.helsinki.fi>, Christoph Lameter <cl@linux-foundation.org> Description: - The file order_fallback is read-only and specifies how many - times an allocation of a new slab has not been possible at the - cache's order and instead fallen back to its minimum possible - order. + The order_fallback file shows how many times an allocation of a + new slab has not been possible at the cache's order and instead + fallen back to its minimum possible order. It can be written to + clear the current count. Available when CONFIG_SLUB_STATS is enabled. What: /sys/kernel/slab/cache/partial diff --git a/mm/slub.c b/mm/slub.c index 4996fc719552..ac0ca4c0d054 100644 --- a/mm/slub.c +++ b/mm/slub.c @@ -4371,12 +4371,28 @@ static int show_stat(struct kmem_cache *s, char *buf, enum stat_item si) return len + sprintf(buf + len, "\n"); } +static void clear_stat(struct kmem_cache *s, enum stat_item si) +{ + int cpu; + + for_each_online_cpu(cpu) + get_cpu_slab(s, cpu)->stat[si] = 0; +} + #define STAT_ATTR(si, text) \ static ssize_t text##_show(struct kmem_cache *s, char *buf) \ { \ return show_stat(s, buf, si); \ } \ -SLAB_ATTR_RO(text); \ +static ssize_t text##_store(struct kmem_cache *s, \ + const char *buf, size_t length) \ +{ \ + if (buf[0] != '0') \ + return -EINVAL; \ + clear_stat(s, si); \ + return length; \ +} \ +SLAB_ATTR(text); \ STAT_ATTR(ALLOC_FASTPATH, alloc_fastpath); STAT_ATTR(ALLOC_SLOWPATH, alloc_slowpath); |