Author: mjg
Date: Fri Jun 8 03:16:16 2018
New Revision: 334824
URL: https://svnweb.freebsd.org/changeset/base/334824
Log:
uma: remove M_ZERO support for pcpu zones
Nothing in the tree uses it and pcpu zones have a fundamentally different use
case than the regular zones - they are not supposed to be allocated and freed
all the time.
This reduces pollution in the allocation fast path.
Modified:
head/sys/vm/uma_core.c
Modified: head/sys/vm/uma_core.c
==============================================================================
--- head/sys/vm/uma_core.c Fri Jun 8 02:03:51 2018 (r334823)
+++ head/sys/vm/uma_core.c Fri Jun 8 03:16:16 2018 (r334824)
@@ -2256,6 +2256,8 @@ uma_zalloc_arg(uma_zone_t zone, void *udata, int flags
}
KASSERT(curthread->td_critnest == 0 || SCHEDULER_STOPPED(),
("uma_zalloc_arg: called with spinlock or critical section held"));
+ if (zone->uz_flags & UMA_ZONE_PCPU)
+ MPASS((flags & M_ZERO) == 0);
#ifdef DEBUG_MEMGUARD
if (memguard_cmp_zone(zone)) {
@@ -3604,13 +3606,8 @@ uma_large_free(uma_slab_t slab)
static void
uma_zero_item(void *item, uma_zone_t zone)
{
- int i;
- if (zone->uz_flags & UMA_ZONE_PCPU) {
- CPU_FOREACH(i)
- bzero(zpcpu_get_cpu(item, i), zone->uz_size);
- } else
- bzero(item, zone->uz_size);
+ bzero(item, zone->uz_size);
}
unsigned long
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