page_pool: Add allocation stats
authorJoe Damato <jdamato@fastly.com>
Wed, 2 Mar 2022 07:55:47 +0000 (23:55 -0800)
committerDavid S. Miller <davem@davemloft.net>
Thu, 3 Mar 2022 09:55:28 +0000 (09:55 +0000)
commit8610037e8106b48c79cfe0afb92b2b2466e51c3d
tree32f1b4cdbf620845dcf8f6af2a37319bc0b1f311
parent42f0c1934c7cb3e94c2fe8f5771245fa5631d0e7
page_pool: Add allocation stats

Add per-pool statistics counters for the allocation path of a page pool.
These stats are incremented in softirq context, so no locking or per-cpu
variables are needed.

This code is disabled by default and a kernel config option is provided for
users who wish to enable them.

The statistics added are:
- fast: successful fast path allocations
- slow: slow path order-0 allocations
- slow_high_order: slow path high order allocations
- empty: ptr ring is empty, so a slow path allocation was forced.
- refill: an allocation which triggered a refill of the cache
- waive: pages obtained from the ptr ring that cannot be added to
  the cache due to a NUMA mismatch.

Signed-off-by: Joe Damato <jdamato@fastly.com>
Acked-by: Jesper Dangaard Brouer <brouer@redhat.com>
Reviewed-by: Ilias Apalodimas <ilias.apalodimas@linaro.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
include/net/page_pool.h
net/Kconfig
net/core/page_pool.c