Commit bba0b4ec authored by Linus Torvalds's avatar Linus Torvalds
Browse files

Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6 

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/penberg/slab-2.6:
  mm: SLOB fix reclaim_state
  mm: SLUB fix reclaim_state
  slub: add Documentation/ABI/testing/sysfs-kernel-slab
  slub: enforce MAX_ORDER
parents 0f6f49a8 42ddc4cb

Documentation/ABI/testing/sysfs-kernel-slab

0 → 100644
+479 −0
Original line number Diff line number Diff line 
What:		/sys/kernel/slab

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The /sys/kernel/slab directory contains a snapshot of the

		internal state of the SLUB allocator for each cache.  Certain

		files may be modified to change the behavior of the cache (and

		any cache it aliases, if any).

Users:		kernel memory tuning tools



What:		/sys/kernel/slab/cache/aliases

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The aliases file is read-only and specifies how many caches

		have merged into this cache.



What:		/sys/kernel/slab/cache/align

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The align file is read-only and specifies the cache's object

		alignment in bytes.



What:		/sys/kernel/slab/cache/alloc_calls

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The alloc_calls file is read-only and lists the kernel code

		locations from which allocations for this cache were performed.

		The alloc_calls file only contains information if debugging is

		enabled for that cache (see Documentation/vm/slub.txt).



What:		/sys/kernel/slab/cache/alloc_fastpath

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/alloc_from_partial

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/alloc_refill

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/alloc_slab

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/alloc_slowpath

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/cache_dma

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The cache_dma file is read-only and specifies whether objects

		are from ZONE_DMA.

		Available when CONFIG_ZONE_DMA is enabled.



What:		/sys/kernel/slab/cache/cpu_slabs

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The cpu_slabs file is read-only and displays how many cpu slabs

		are active and their NUMA locality.



What:		/sys/kernel/slab/cache/cpuslab_flush

Date:		April 2009

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/ctor

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The ctor file is read-only and specifies the cache's object

		constructor function, which is invoked for each object when a

		new slab is allocated.



What:		/sys/kernel/slab/cache/deactivate_empty

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/deactivate_full

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/deactivate_remote_frees

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/deactivate_to_head

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/deactivate_to_tail

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/destroy_by_rcu

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The destroy_by_rcu file is read-only and specifies whether

		slabs (not objects) are freed by rcu.



What:		/sys/kernel/slab/cache/free_add_partial

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/free_calls

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The free_calls file is read-only and lists the locations of

		object frees if slab debugging is enabled (see

		Documentation/vm/slub.txt).



What:		/sys/kernel/slab/cache/free_fastpath

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/free_frozen

Date:		February 2008

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).

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/free_remove_partial

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/free_slab

Date:		February 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/free_slowpath

Date:		February 2008

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).

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/hwcache_align

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The hwcache_align file is read-only and specifies whether

		objects are aligned on cachelines.



What:		/sys/kernel/slab/cache/min_partial

Date:		February 2009

KernelVersion:	2.6.30

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		David Rientjes <rientjes@google.com>

Description:

		The min_partial file specifies how many empty slabs shall

		remain on a node's partial list to avoid the overhead of

		allocating new slabs.  Such slabs may be reclaimed by utilizing

		the shrink file.



What:		/sys/kernel/slab/cache/object_size

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The object_size file is read-only and specifies the cache's

		object size.



What:		/sys/kernel/slab/cache/objects

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The objects file is read-only and displays how many objects are

		active and from which nodes they are from.



What:		/sys/kernel/slab/cache/objects_partial

Date:		April 2008

KernelVersion:	2.6.26

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The objects_partial file is read-only and displays how many

		objects are on partial slabs and from which nodes they are

		from.



What:		/sys/kernel/slab/cache/objs_per_slab

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The file objs_per_slab is read-only and specifies how many

		objects may be allocated from a single slab of the order

		specified in /sys/kernel/slab/cache/order.



What:		/sys/kernel/slab/cache/order

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The order file specifies the page order at which new slabs are

		allocated.  It is writable and can be changed to increase the

		number of objects per slab.  If a slab cannot be allocated

		because of fragmentation, SLUB will retry with the minimum order

		possible depending on its characteristics.



What:		/sys/kernel/slab/cache/order_fallback

Date:		April 2008

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.

		Available when CONFIG_SLUB_STATS is enabled.



What:		/sys/kernel/slab/cache/partial

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The partial file is read-only and displays how long many

		partial slabs there are and how long each node's list is.



What:		/sys/kernel/slab/cache/poison

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The poison file specifies whether objects should be poisoned

		when a new slab is allocated.



What:		/sys/kernel/slab/cache/reclaim_account

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The reclaim_account file specifies whether the cache's objects

		are reclaimable (and grouped by their mobility).



What:		/sys/kernel/slab/cache/red_zone

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The red_zone file specifies whether the cache's objects are red

		zoned.



What:		/sys/kernel/slab/cache/remote_node_defrag_ratio

Date:		January 2008

KernelVersion:	2.6.25

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The file remote_node_defrag_ratio specifies the percentage of

		times SLUB will attempt to refill the cpu slab with a partial

		slab from a remote node as opposed to allocating a new slab on

		the local node.  This reduces the amount of wasted memory over

		the entire system but can be expensive.

		Available when CONFIG_NUMA is enabled.



What:		/sys/kernel/slab/cache/sanity_checks

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The sanity_checks file specifies whether expensive checks

		should be performed on free and, at minimum, enables double free

		checks.  Caches that enable sanity_checks cannot be merged with

		caches that do not.



What:		/sys/kernel/slab/cache/shrink

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The shrink file is written when memory should be reclaimed from

		a cache.  Empty partial slabs are freed and the partial list is

		sorted so the slabs with the fewest available objects are used

		first.



What:		/sys/kernel/slab/cache/slab_size

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The slab_size file is read-only and specifies the object size

		with metadata (debugging information and alignment) in bytes.



What:		/sys/kernel/slab/cache/slabs

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The slabs file is read-only and displays how long many slabs

		there are (both cpu and partial) and from which nodes they are

		from.



What:		/sys/kernel/slab/cache/store_user

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The store_user file specifies whether the location of

		allocation or free should be tracked for a cache.



What:		/sys/kernel/slab/cache/total_objects

Date:		April 2008

KernelVersion:	2.6.26

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The total_objects file is read-only and displays how many total

		objects a cache has and from which nodes they are from.



What:		/sys/kernel/slab/cache/trace

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		The trace file specifies whether object allocations and frees

		should be traced.



What:		/sys/kernel/slab/cache/validate

Date:		May 2007

KernelVersion:	2.6.22

Contact:	Pekka Enberg <penberg@cs.helsinki.fi>,

		Christoph Lameter <cl@linux-foundation.org>

Description:

		Writing to the validate file causes SLUB to traverse all of its

		cache's objects and check the validity of metadata.

mm/slob.c

+4 −1
Original line number Diff line number Diff line
@@ -60,6 +60,7 @@ 
#include <linux/kernel.h>

#include <linux/slab.h>

#include <linux/mm.h>

#include <linux/swap.h> /* struct reclaim_state */

#include <linux/cache.h>

#include <linux/init.h>

#include <linux/module.h>
@@ -255,6 +256,8 @@ static void *slob_new_pages(gfp_t gfp, int order, int node) 


static void slob_free_pages(void *b, int order)

{

	if (current->reclaim_state)

		current->reclaim_state->reclaimed_slab += 1 << order;

	free_pages((unsigned long)b, order);

}
@@ -407,7 +410,7 @@ static void slob_free(void *block, int size) 
		spin_unlock_irqrestore(&slob_lock, flags);

		clear_slob_page(sp);

		free_slob_page(sp);

		free_page((unsigned long)b);

		slob_free_pages(b, 0);

		return;

	}

mm/slub.c

+5 −1
Original line number Diff line number Diff line
@@ -9,6 +9,7 @@ 
 */



#include <linux/mm.h>

#include <linux/swap.h> /* struct reclaim_state */

#include <linux/module.h>

#include <linux/bit_spinlock.h>

#include <linux/interrupt.h>
@@ -1170,6 +1171,8 @@ static void __free_slab(struct kmem_cache *s, struct page *page) 


	__ClearPageSlab(page);

	reset_page_mapcount(page);

	if (current->reclaim_state)

		current->reclaim_state->reclaimed_slab += pages;

	__free_pages(page, order);

}
@@ -1909,7 +1912,7 @@ static inline int calculate_order(int size) 
	 * Doh this slab cannot be placed using slub_max_order.

	 */

	order = slab_order(size, 1, MAX_ORDER, 1);

	if (order <= MAX_ORDER)

	if (order < MAX_ORDER)

		return order;

	return -ENOSYS;

}
@@ -2522,6 +2525,7 @@ __setup("slub_min_order=", setup_slub_min_order); 
static int __init setup_slub_max_order(char *str)

{

	get_option(&str, &slub_max_order);

	slub_max_order = min(slub_max_order, MAX_ORDER - 1);



	return 1;

}

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