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Linux: Reclaim unused spl_kmem_cache_reclaim

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It is unused for 3 years since #10576.

Reviewed-by: George Melikov <mail@gmelikov.ru>
Reviewed-by: Brian Behlendorf <behlendorf1@llnl.gov>
Signed-off-by:	Alexander Motin <mav@FreeBSD.org>
Sponsored by:	iXsystems, Inc.
Closes #15507
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Alexander Motin 2023-11-10 13:34:46 -05:00 committed by GitHub
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2
include/os/linux/spl/sys/kmem_cache.h
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@ -70,8 +70,6 @@ typedef enum kmem_cbrc {
#define KMC_REAP_CHUNK INT_MAX
#define KMC_DEFAULT_SEEKS 1
#define KMC_RECLAIM_ONCE 0x1 /* Force a single shrinker pass */
extern struct list_head spl_kmem_cache_list;
extern struct rw_semaphore spl_kmem_cache_sem;

8
man/man4/spl.4
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@ -31,14 +31,6 @@ for use by the kmem caches.
For the majority of systems and workloads only a small number of threads are
required.
.
.It Sy spl_kmem_cache_reclaim Ns = Ns Sy 0 Pq uint
When this is set it prevents Linux from being able to rapidly reclaim all the
memory held by the kmem caches.
This may be useful in circumstances where it's preferable that Linux
reclaim memory from some other subsystem first.
Setting this will increase the likelihood out of memory events on a memory
constrained system.
.
.It Sy spl_kmem_cache_obj_per_slab Ns = Ns Sy 8 Pq uint
The preferred number of objects per slab in the cache.
In general, a larger value will increase the caches memory footprint

11
module/os/linux/spl/spl-kmem-cache.c
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@ -76,17 +76,6 @@ module_param(spl_kmem_cache_magazine_size, uint, 0444);
MODULE_PARM_DESC(spl_kmem_cache_magazine_size,
"Default magazine size (2-256), set automatically (0)");
/*
* The default behavior is to report the number of objects remaining in the
* cache. This allows the Linux VM to repeatedly reclaim objects from the
* cache when memory is low satisfy other memory allocations. Alternately,
* setting this value to KMC_RECLAIM_ONCE limits how aggressively the cache
* is reclaimed. This may increase the likelihood of out of memory events.
*/
static unsigned int spl_kmem_cache_reclaim = 0 /* KMC_RECLAIM_ONCE */;
module_param(spl_kmem_cache_reclaim, uint, 0644);
MODULE_PARM_DESC(spl_kmem_cache_reclaim, "Single reclaim pass (0x1)");
static unsigned int spl_kmem_cache_obj_per_slab = SPL_KMEM_CACHE_OBJ_PER_SLAB;
module_param(spl_kmem_cache_obj_per_slab, uint, 0644);
MODULE_PARM_DESC(spl_kmem_cache_obj_per_slab, "Number of objects per slab");