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Add a UMA zone flag to disable the use of buckets.

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This allows the creation of zones which don't do any caching in front of
the keg. If the zone is a cache zone, this means that UMA will not
attempt any memory allocations when allocating an item from the backend.
This is intended for use after a panic by netdump, but likely has other
applications.

Reviewed by:	kib
MFC after:	2 weeks
Sponsored by:	Dell EMC Isilon
Differential Revision:	https://reviews.freebsd.org/D15184
This commit is contained in:
Mark Johnston 2018-04-24 20:05:45 +00:00
parent 7875017ca9
commit 7e28037a09
2 changed files with 10 additions and 5 deletions
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4
sys/vm/uma.h
View File

@ -265,8 +265,8 @@ uma_zone_t uma_zcache_create(char *name, int size, uma_ctor ctor, uma_dtor dtor,
* information in the vm_page.
*/
#define UMA_ZONE_SECONDARY 0x0200 /* Zone is a Secondary Zone */
/* 0x0400 Unused */
#define UMA_ZONE_MAXBUCKET 0x0800 /* Use largest buckets */
#define UMA_ZONE_NOBUCKET 0x0400 /* Do not use buckets. */
#define UMA_ZONE_MAXBUCKET 0x0800 /* Use largest buckets. */
#define UMA_ZONE_CACHESPREAD 0x1000 /*
* Spread memory start locations across
* all possible cache lines. May

11
sys/vm/uma_core.c
View File

@ -1681,10 +1681,15 @@ zone_ctor(void *mem, int size, void *udata, int flags)
}
out:
if ((arg->flags & UMA_ZONE_MAXBUCKET) == 0)
zone->uz_count = bucket_select(zone->uz_size);
else
KASSERT((arg->flags & (UMA_ZONE_MAXBUCKET | UMA_ZONE_NOBUCKET)) !=
(UMA_ZONE_MAXBUCKET | UMA_ZONE_NOBUCKET),
("Invalid zone flag combination"));
if ((arg->flags & UMA_ZONE_MAXBUCKET) != 0)
zone->uz_count = BUCKET_MAX;
else if ((arg->flags & UMA_ZONE_NOBUCKET) != 0)
zone->uz_count = 0;
else
zone->uz_count = bucket_select(zone->uz_size);
zone->uz_count_min = zone->uz_count;
return (0);