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page_pool: Add allocation stats

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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>
This commit is contained in:
Joe Damato
2022-03-01 23:55:47 -08:00
committed by David S. Miller
parent 42f0c1934c
commit 8610037e81
3 changed files with 51 additions and 4 deletions
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18
include/net/page_pool.h
View File

@@ -84,6 +84,19 @@ struct page_pool_params {
void *init_arg;
};
#ifdef CONFIG_PAGE_POOL_STATS
struct page_pool_alloc_stats {
u64 fast; /* fast path allocations */
u64 slow; /* slow-path order 0 allocations */
u64 slow_high_order; /* slow-path high order allocations */
u64 empty; /* failed refills due to empty ptr ring, forcing
* slow path allocation
*/
u64 refill; /* allocations via successful refill */
u64 waive; /* failed refills due to numa zone mismatch */
};
#endif
struct page_pool {
struct page_pool_params p;
@@ -96,6 +109,11 @@ struct page_pool {
unsigned int frag_offset;
struct page *frag_page;
long frag_users;
#ifdef CONFIG_PAGE_POOL_STATS
/* these stats are incremented while in softirq context */
struct page_pool_alloc_stats alloc_stats;
#endif
u32 xdp_mem_id;
/*