[RFC v1 0/2] slabinfo: sheaves statistics support

[Harry Yoo <harry.yoo@oracle.com>]

With this series, `slabinfo -r` now prints sheaves statistics (if enabled).
Written on top of slub-percpu-sheaves-v4r0 [1] branch.

Q1: Vlastimil, do you want to integrate this into the sheaves series or do
you want me to send it as a follow-up series after sheaves land mainline?

Q2: 'sheaf_swap' does not fit into the table because SLUB swaps sheaves both
at alloc and free. Probably split the counter?

[1] https://git.kernel.org/pub/scm/linux/kernel/git/vbabka/linux.git/log/?h=slub-percpu-sheaves-v4r0

$ sudo ./slabinfo -r maple_node
Slabcache: maple_node       Aliases:  0 Order :  1 Objects: 8268

[... snip ...]

Slab Perf Counter       Alloc     Free %Al %Fr
----------------------------------------------
Fastpath               258760     5109  93   3
Slowpath                18205   126605   6  96
Page Alloc                903      520   0   0
Add partial                 0    14600   0  11
Remove partial           3472      420   1   0
Cpu partial list        12235    16577   4  12
RemoteObj/SlabFrozen        0     5969   0   4
Total                  276965   131714


Slab Sheaves Counter       Alloc    Free  %Al  %Fr  %Fa
-------------------------------------------------------
Served from sheaves     1805673   580161   86   93  N/A
Sheaves refill           236384      N/A   13  N/A  N/A
Sheaves alloc              3872     3794    0    0  N/A
Free to RCU sheaves         N/A  1255815  N/A   68    0
Main sheaf flush            N/A        0  N/A    0  N/A
Other sheaves flush         N/A   265600  N/A   14  N/A

Slab Deactivation             Occurrences %
-------------------------------------------
Slab full                           0    0%
Slab empty                        100    0%
Moved to head of partial list       0    0%
Moved to tail of partial list       0    0%
Deactivation bypass             16588   99%
Refilled from foreign frees      1595    9%
Node mismatch                       0    0%

Harry Yoo (2):
  mm/slab: add sheaves_enabled read-only sysfs file
  tools/mm/slabinfo: add support for sheaves stats

 mm/slub.c           | 10 ++++++++
 tools/mm/slabinfo.c | 62 +++++++++++++++++++++++++++++++++++++++++++--
 2 files changed, 70 insertions(+), 2 deletions(-)

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2.43.0