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355d79c8
编写于
12月 12, 2009
作者:
P
Pekka Enberg
浏览文件
操作
浏览文件
下载
差异文件
Merge branches 'slab/fixes', 'slab/kmemleak', 'slub/perf' and 'slub/stats' into for-linus
上级
053fe57a
8e15b79c
ddbf2e83
74e2134f
78eb00cc
变更
3
隐藏空白更改
内联
并排
Showing
3 changed file
with
145 addition
and
102 deletion
+145
-102
Documentation/ABI/testing/sysfs-kernel-slab
Documentation/ABI/testing/sysfs-kernel-slab
+58
-51
mm/slab.c
mm/slab.c
+69
-49
mm/slub.c
mm/slub.c
+18
-2
未找到文件。
Documentation/ABI/testing/sysfs-kernel-slab
浏览文件 @
355d79c8
...
...
@@ -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 lis
t.
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 coun
t.
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 lis
t.
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 coun
t.
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 f
ile 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 lis
t.
The f
ree_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 coun
t.
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
...
...
mm/slab.c
浏览文件 @
355d79c8
...
...
@@ -604,6 +604,26 @@ static struct kmem_cache cache_cache = {
#define BAD_ALIEN_MAGIC 0x01020304ul
/*
* chicken and egg problem: delay the per-cpu array allocation
* until the general caches are up.
*/
static
enum
{
NONE
,
PARTIAL_AC
,
PARTIAL_L3
,
EARLY
,
FULL
}
g_cpucache_up
;
/*
* used by boot code to determine if it can use slab based allocator
*/
int
slab_is_available
(
void
)
{
return
g_cpucache_up
>=
EARLY
;
}
#ifdef CONFIG_LOCKDEP
/*
...
...
@@ -620,40 +640,52 @@ static struct kmem_cache cache_cache = {
static
struct
lock_class_key
on_slab_l3_key
;
static
struct
lock_class_key
on_slab_alc_key
;
static
inline
void
init_lock_keys
(
void
)
static
void
init_node_lock_keys
(
int
q
)
{
int
q
;
struct
cache_sizes
*
s
=
malloc_sizes
;
while
(
s
->
cs_size
!=
ULONG_MAX
)
{
for_each_node
(
q
)
{
struct
array_cache
**
alc
;
int
r
;
struct
kmem_list3
*
l3
=
s
->
cs_cachep
->
nodelists
[
q
];
if
(
!
l3
||
OFF_SLAB
(
s
->
cs_cachep
))
continue
;
lockdep_set_class
(
&
l3
->
list_lock
,
&
on_slab_l3_key
);
alc
=
l3
->
alien
;
/*
* FIXME: This check for BAD_ALIEN_MAGIC
* should go away when common slab code is taught to
* work even without alien caches.
* Currently, non NUMA code returns BAD_ALIEN_MAGIC
* for alloc_alien_cache,
*/
if
(
!
alc
||
(
unsigned
long
)
alc
==
BAD_ALIEN_MAGIC
)
continue
;
for_each_node
(
r
)
{
if
(
alc
[
r
])
lockdep_set_class
(
&
alc
[
r
]
->
lock
,
&
on_slab_alc_key
);
}
if
(
g_cpucache_up
!=
FULL
)
return
;
for
(
s
=
malloc_sizes
;
s
->
cs_size
!=
ULONG_MAX
;
s
++
)
{
struct
array_cache
**
alc
;
struct
kmem_list3
*
l3
;
int
r
;
l3
=
s
->
cs_cachep
->
nodelists
[
q
];
if
(
!
l3
||
OFF_SLAB
(
s
->
cs_cachep
))
return
;
lockdep_set_class
(
&
l3
->
list_lock
,
&
on_slab_l3_key
);
alc
=
l3
->
alien
;
/*
* FIXME: This check for BAD_ALIEN_MAGIC
* should go away when common slab code is taught to
* work even without alien caches.
* Currently, non NUMA code returns BAD_ALIEN_MAGIC
* for alloc_alien_cache,
*/
if
(
!
alc
||
(
unsigned
long
)
alc
==
BAD_ALIEN_MAGIC
)
return
;
for_each_node
(
r
)
{
if
(
alc
[
r
])
lockdep_set_class
(
&
alc
[
r
]
->
lock
,
&
on_slab_alc_key
);
}
s
++
;
}
}
static
inline
void
init_lock_keys
(
void
)
{
int
node
;
for_each_node
(
node
)
init_node_lock_keys
(
node
);
}
#else
static
void
init_node_lock_keys
(
int
q
)
{
}
static
inline
void
init_lock_keys
(
void
)
{
}
...
...
@@ -665,26 +697,6 @@ static inline void init_lock_keys(void)
static
DEFINE_MUTEX
(
cache_chain_mutex
);
static
struct
list_head
cache_chain
;
/*
* chicken and egg problem: delay the per-cpu array allocation
* until the general caches are up.
*/
static
enum
{
NONE
,
PARTIAL_AC
,
PARTIAL_L3
,
EARLY
,
FULL
}
g_cpucache_up
;
/*
* used by boot code to determine if it can use slab based allocator
*/
int
slab_is_available
(
void
)
{
return
g_cpucache_up
>=
EARLY
;
}
static
DEFINE_PER_CPU
(
struct
delayed_work
,
reap_work
);
static
inline
struct
array_cache
*
cpu_cache_get
(
struct
kmem_cache
*
cachep
)
...
...
@@ -1254,6 +1266,8 @@ static int __cpuinit cpuup_prepare(long cpu)
kfree
(
shared
);
free_alien_cache
(
alien
);
}
init_node_lock_keys
(
node
);
return
0
;
bad:
cpuup_canceled
(
cpu
);
...
...
@@ -3103,13 +3117,19 @@ static inline void *____cache_alloc(struct kmem_cache *cachep, gfp_t flags)
}
else
{
STATS_INC_ALLOCMISS
(
cachep
);
objp
=
cache_alloc_refill
(
cachep
,
flags
);
/*
* the 'ac' may be updated by cache_alloc_refill(),
* and kmemleak_erase() requires its correct value.
*/
ac
=
cpu_cache_get
(
cachep
);
}
/*
* To avoid a false negative, if an object that is in one of the
* per-CPU caches is leaked, we need to make sure kmemleak doesn't
* treat the array pointers as a reference to the object.
*/
kmemleak_erase
(
&
ac
->
entry
[
ac
->
avail
]);
if
(
objp
)
kmemleak_erase
(
&
ac
->
entry
[
ac
->
avail
]);
return
objp
;
}
...
...
@@ -3306,7 +3326,7 @@ __cache_alloc_node(struct kmem_cache *cachep, gfp_t flags, int nodeid,
cache_alloc_debugcheck_before
(
cachep
,
flags
);
local_irq_save
(
save_flags
);
if
(
unlikely
(
nodeid
==
-
1
)
)
if
(
nodeid
==
-
1
)
nodeid
=
numa_node_id
();
if
(
unlikely
(
!
cachep
->
nodelists
[
nodeid
]))
{
...
...
mm/slub.c
浏览文件 @
355d79c8
...
...
@@ -1735,7 +1735,7 @@ static __always_inline void *slab_alloc(struct kmem_cache *s,
}
local_irq_restore
(
flags
);
if
(
unlikely
(
(
gfpflags
&
__GFP_ZERO
)
&&
object
)
)
if
(
unlikely
(
gfpflags
&
__GFP_ZERO
)
&&
object
)
memset
(
object
,
0
,
objsize
);
kmemcheck_slab_alloc
(
s
,
gfpflags
,
object
,
c
->
objsize
);
...
...
@@ -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
);
...
...
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