Author: delphij
Date: Thu Aug 14 05:13:24 2014
New Revision: 269963
URL: http://svnweb.freebsd.org/changeset/base/269963
Log:
Re-instate UMA cached backend for 4K - 64K allocations. New consumers
like geli(4) uses malloc(9) to allocate temporary buffers that gets
free'ed shortly, causing frequent TLB shootdown as observed in hwpmc
supported flame graph.
Discussed with: jeff, alfred
MFC after: 1 week
Modified:
head/sys/kern/kern_malloc.c
Modified: head/sys/kern/kern_malloc.c
==============================================================================
--- head/sys/kern/kern_malloc.c Thu Aug 14 05:00:45 2014 (r269962)
+++ head/sys/kern/kern_malloc.c Thu Aug 14 05:13:24 2014 (r269963)
@@ -120,7 +120,7 @@ static int kmemcount;
#define KMEM_ZBASE 16
#define KMEM_ZMASK (KMEM_ZBASE - 1)
-#define KMEM_ZMAX PAGE_SIZE
+#define KMEM_ZMAX 65536
#define KMEM_ZSIZE (KMEM_ZMAX >> KMEM_ZSHIFT)
static uint8_t kmemsize[KMEM_ZSIZE + 1];
@@ -151,21 +151,10 @@ struct {
{1024, "1024", },
{2048, "2048", },
{4096, "4096", },
-#if PAGE_SIZE > 4096
{8192, "8192", },
-#if PAGE_SIZE > 8192
{16384, "16384", },
-#if PAGE_SIZE > 16384
{32768, "32768", },
-#if PAGE_SIZE > 32768
{65536, "65536", },
-#if PAGE_SIZE > 65536
-#error "Unsupported PAGE_SIZE"
-#endif /* 65536 */
-#endif /* 32768 */
-#endif /* 16384 */
-#endif /* 8192 */
-#endif /* 4096 */
{0, NULL},
};
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