docs: rename Documentation/vm to Documentation/mm

so it will be consistent with code mm directory and with
Documentation/admin-guide/mm and won't be confused with virtual machines.

Signed-off-by: M

docs: rename Documentation/vm to Documentation/mm

so it will be consistent with code mm directory and with
Documentation/admin-guide/mm and won't be confused with virtual machines.

Signed-off-by: Mike Rapoport <[email protected]>
Suggested-by: Matthew Wilcox <[email protected]>
Tested-by: Ira Weiny <[email protected]>
Acked-by: Jonathan Corbet <[email protected]>
Acked-by: Wu XiangCheng <[email protected]>

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ABI: sysfs-kernel-slab: Document some stats

Document three slab stats that were added in 2011 and 2017.

Fixes: 49e2258586b4 ("slub: per cpu cache for partial pages")
Fixes: 8eb8284b4129 ("usercopy:

ABI: sysfs-kernel-slab: Document some stats

Document three slab stats that were added in 2011 and 2017.

Fixes: 49e2258586b4 ("slub: per cpu cache for partial pages")
Fixes: 8eb8284b4129 ("usercopy: Prepare for usercopy whitelisting")

Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Link: https://lore.kernel.org/r/8960435734c5aa918568ce7891171448c4d68709.1632750608.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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ABI: sysfs-kernel-slab: use a wildcard for the cache name

the "cache" part of the description is actually a wildcard,
as, in practice, this will use per-subsystem names:

/sys/kernel/slab/Acpi-N

ABI: sysfs-kernel-slab: use a wildcard for the cache name

the "cache" part of the description is actually a wildcard,
as, in practice, this will use per-subsystem names:

/sys/kernel/slab/Acpi-Namespace/align
/sys/kernel/slab/Acpi-Operand/align
/sys/kernel/slab/Acpi-Parse/align
...
/sys/kernel/slab/zswap_entry/align

Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Link: https://lore.kernel.org/r/64095cc0a38d0f675ab798d4f04d8631674b59f7.1631782432.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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docs: ABI: cleanup several ABI documents

There are some ABI documents that, while they don't generate
any warnings, they have issues when parsed by get_abi.pl script
on its output result.

Address t

docs: ABI: cleanup several ABI documents

There are some ABI documents that, while they don't generate
any warnings, they have issues when parsed by get_abi.pl script
on its output result.

Address them, in order to provide a clean output.

Reviewed-by: Tom Rix <[email protected]> # for fpga-manager
Reviewed-By: Kajol Jain<[email protected]> # for sysfs-bus-event_source-devices-hv_gpci and sysfs-bus-event_source-devices-hv_24x7
Acked-by: Jonathan Cameron <[email protected]> #for IIO
Acked-by: Oded Gabbay <[email protected]> # for Habanalabs
Acked-by: Vaibhav Jain <[email protected]> # for sysfs-bus-papr-pmem
Acked-by: Cezary Rojewski <[email protected]> # for catpt
Acked-by: Suzuki K Poulose <[email protected]>
Acked-by: Ilya Dryomov <[email protected]> # for rbd
Acked-by: Jonathan Corbet <[email protected]>
Signed-off-by: Mauro Carvalho Chehab <[email protected]>
Link: https://lore.kernel.org/r/5bc78e5b68ed1e9e39135173857cb2e753be868f.1604042072.git.mchehab+huawei@kernel.org
Signed-off-by: Greg Kroah-Hartman <[email protected]>

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mm, slab: extend slab/shrink to shrink all memcg caches

Currently, a value of '1" is written to /sys/kernel/slab/<slab>/shrink
file to shrink the slab by flushing out all the per-cpu slabs and free

mm, slab: extend slab/shrink to shrink all memcg caches

Currently, a value of '1" is written to /sys/kernel/slab/<slab>/shrink
file to shrink the slab by flushing out all the per-cpu slabs and free
slabs in partial lists. This can be useful to squeeze out a bit more
memory under extreme condition as well as making the active object counts
in /proc/slabinfo more accurate.

This usually applies only to the root caches, as the SLUB_MEMCG_SYSFS_ON
option is usually not enabled and "slub_memcg_sysfs=1" not set. Even if
memcg sysfs is turned on, it is too cumbersome and impractical to manage
all those per-memcg sysfs files in a real production system.

So there is no practical way to shrink memcg caches. Fix this by enabling
a proper write to the shrink sysfs file of the root cache to scan all the
available memcg caches and shrink them as well. For a non-root memcg
cache (when SLUB_MEMCG_SYSFS_ON or slub_memcg_sysfs is on), only that
cache will be shrunk when written.

On a 2-socket 64-core 256-thread arm64 system with 64k page after
a parallel kernel build, the the amount of memory occupied by slabs
before shrinking slabs were:

# grep task_struct /proc/slabinfo
task_struct 53137 53192 4288 61 4 : tunables 0 0
0 : slabdata 872 872 0
# grep "^S[lRU]" /proc/meminfo
Slab: 3936832 kB
SReclaimable: 399104 kB
SUnreclaim: 3537728 kB

After shrinking slabs (by echoing "1" to all shrink files):

# grep "^S[lRU]" /proc/meminfo
Slab: 1356288 kB
SReclaimable: 263296 kB
SUnreclaim: 1092992 kB
# grep task_struct /proc/slabinfo
task_struct 2764 6832 4288 61 4 : tunables 0 0
0 : slabdata 112 112 0

Link: http://lkml.kernel.org/r/[email protected]
Signed-off-by: Waiman Long <[email protected]>
Acked-by: Roman Gushchin <[email protected]>
Acked-by: Christoph Lameter <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: David Rientjes <[email protected]>
Cc: Joonsoo Kim <[email protected]>
Cc: Michal Hocko <[email protected]>
Cc: Johannes Weiner <[email protected]>
Cc: Shakeel Butt <[email protected]>
Cc: Vladimir Davydov <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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docs/vm: rename documentation files to .rst

Signed-off-by: Mike Rapoport <[email protected]>
Signed-off-by: Jonathan Corbet <[email protected]>

docs: fix locations of several documents that got moved

The previous patch renamed several files that are cross-referenced
along the Kernel documentation. Adjust the links to point to
the right plac

docs: fix locations of several documents that got moved

The previous patch renamed several files that are cross-referenced
along the Kernel documentation. Adjust the links to point to
the right places.

Signed-off-by: Mauro Carvalho Chehab <[email protected]>

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slub: document setting min order with debug_guardpage_minorder > 0

Acked-by: David Rientjes <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Sign

slub: document setting min order with debug_guardpage_minorder > 0

Acked-by: David Rientjes <[email protected]>
Cc: Pekka Enberg <[email protected]>
Cc: "Rafael J. Wysocki" <[email protected]>
Signed-off-by: Stanislaw Gruszka <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>

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slub: allow stats to be cleared

When collecting slub stats for particular workloads, it's necessary to
collect each statistic for all caches before the job is even started
because the counters are u

slub: allow stats to be cleared

When collecting slub stats for particular workloads, it's necessary to
collect each statistic for all caches before the job is even started
because the counters are usually greater than zero just from boot and
initialization.

This allows a statistic to be cleared on each cpu by writing '0' to its
sysfs file. This creates a baseline for statistics of interest before
the workload is started.

Setting a statistic to a particular value is not supported, so all values
written to these files other than '0' returns -EINVAL.

Cc: Christoph Lameter <[email protected]>
Signed-off-by: David Rientjes <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>

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slub: add Documentation/ABI/testing/sysfs-kernel-slab

Adds documentation for the slub ABI.

This is placed in the `testing' directory since the meanings of these
files are still subject to change as

slub: add Documentation/ABI/testing/sysfs-kernel-slab

Adds documentation for the slub ABI.

This is placed in the `testing' directory since the meanings of these
files are still subject to change as slub is developed.

Acked-by: Christoph Lameter <[email protected]>
Cc: Randy Dunlap <[email protected]>
Signed-off-by: David Rientjes <[email protected]>
Signed-off-by: Pekka Enberg <[email protected]>

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