mirror of https://github.com/Qortal/Brooklyn
You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
498 lines
17 KiB
498 lines
17 KiB
What: /sys/kernel/slab |
|
Date: May 2007 |
|
KernelVersion: 2.6.22 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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.rst). |
|
|
|
What: /sys/kernel/slab/cache/alloc_fastpath |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: May 2007 |
|
KernelVersion: 2.6.22 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: May 2007 |
|
KernelVersion: 2.6.22 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: May 2007 |
|
KernelVersion: 2.6.22 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: May 2007 |
|
KernelVersion: 2.6.22 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
The free_calls file is read-only and lists the locations of |
|
object frees if slab debugging is enabled (see |
|
Documentation/vm/slub.rst). |
|
|
|
What: /sys/kernel/slab/cache/free_fastpath |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: February 2008 |
|
KernelVersion: 2.6.25 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: May 2007 |
|
KernelVersion: 2.6.22 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
David Rientjes <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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. |
|
|
|
When debug_guardpage_minorder=N (N > 0) parameter is specified |
|
(see Documentation/admin-guide/kernel-parameters.rst), the minimum possible |
|
order is used and this sysfs entry can not be used to change |
|
the order at run time. |
|
|
|
What: /sys/kernel/slab/cache/order_fallback |
|
Date: April 2008 |
|
KernelVersion: 2.6.26 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
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 |
|
Date: May 2007 |
|
KernelVersion: 2.6.22 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
The shrink file is used to reclaim unused slab cache |
|
memory from a cache. Empty per-cpu or partial slabs |
|
are freed and the partial list is sorted so the slabs |
|
with the fewest available objects are used first. |
|
It only accepts a value of "1" on write for shrinking |
|
the cache. Other input values are considered invalid. |
|
Shrinking slab caches might be expensive and can |
|
adversely impact other running applications. So it |
|
should be used with care. |
|
|
|
What: /sys/kernel/slab/cache/slab_size |
|
Date: May 2007 |
|
KernelVersion: 2.6.22 |
|
Contact: Pekka Enberg <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
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 <[email protected]>, |
|
Christoph Lameter <[email protected]> |
|
Description: |
|
Writing to the validate file causes SLUB to traverse all of its |
|
cache's objects and check the validity of metadata.
|
|
|