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Add kmem_cache flag for forcing kvmalloc

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This adds a new KMC_KVMEM flag was added to enforce use of the
kvmalloc allocator in kmem_cache_create even for large blocks, which
may also increase performance in some specific cases (e.g. zstd), too.

Default to KVMEM instead of VMEM in spl_kmem_cache_create.

Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Reviewed-by: Matt Ahrens <matt@delphix.com>
Signed-off-by: Sebastian Gottschall <s.gottschall@dd-wrt.com>
Signed-off-by: Michael Niewöhner <foss@mniewoehner.de>
Closes #9034
This commit is contained in:
Michael Niewöhner
2019-07-21 19:34:10 +02:00
committed by Brian Behlendorf
parent 66955885e2
commit 6d948c3519
5 changed files with 43 additions and 11 deletions
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include/os/linux/spl/sys/kmem_cache.h
+4 -2
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@@ -43,8 +43,9 @@ typedef enum kmc_bit {
KMC_BIT_QCACHE = 4, /* XXX: Unsupported */
KMC_BIT_KMEM = 5, /* Use kmem cache */
KMC_BIT_VMEM = 6, /* Use vmem cache */
KMC_BIT_SLAB = 7, /* Use Linux slab cache */
KMC_BIT_OFFSLAB = 8, /* Objects not on slab */
KMC_BIT_KVMEM = 7, /* Use kvmalloc linux allocator */
KMC_BIT_SLAB = 8, /* Use Linux slab cache */
KMC_BIT_OFFSLAB = 9, /* Objects not on slab */
KMC_BIT_DEADLOCKED = 14, /* Deadlock detected */
KMC_BIT_GROWING = 15, /* Growing in progress */
KMC_BIT_REAPING = 16, /* Reaping in progress */
@@ -70,6 +71,7 @@ typedef enum kmem_cbrc {
#define KMC_QCACHE (1 << KMC_BIT_QCACHE)
#define KMC_KMEM (1 << KMC_BIT_KMEM)
#define KMC_VMEM (1 << KMC_BIT_VMEM)
#define KMC_KVMEM (1 << KMC_BIT_KVMEM)
#define KMC_SLAB (1 << KMC_BIT_SLAB)
#define KMC_OFFSLAB (1 << KMC_BIT_OFFSLAB)
#define KMC_DEADLOCKED (1 << KMC_BIT_DEADLOCKED)