mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-11-18 10:21:01 +03:00
e76f4bf11d
Provide the dnlc_reduce_cache() function which attempts to prune cached entries from the dcache and icache. After the entries are pruned any slabs which they may have been using are reaped. Note the API takes a reclaim percentage but we don't have easy access to the total number of cache entries to calculate the reclaim count. However, in practice this doesn't need to be exactly correct. We simply need to reclaim some useful fraction (but not all) of the cache. The caller can determine if more needs to be done.
142 lines
4.9 KiB
C
142 lines
4.9 KiB
C
/*****************************************************************************\
|
|
* Copyright (C) 2007-2010 Lawrence Livermore National Security, LLC.
|
|
* Copyright (C) 2007 The Regents of the University of California.
|
|
* Produced at Lawrence Livermore National Laboratory (cf, DISCLAIMER).
|
|
* Written by Brian Behlendorf <behlendorf1@llnl.gov>.
|
|
* UCRL-CODE-235197
|
|
*
|
|
* This file is part of the SPL, Solaris Porting Layer.
|
|
* For details, see <http://github.com/behlendorf/spl/>.
|
|
*
|
|
* The SPL is free software; you can redistribute it and/or modify it
|
|
* under the terms of the GNU General Public License as published by the
|
|
* Free Software Foundation; either version 2 of the License, or (at your
|
|
* option) any later version.
|
|
*
|
|
* The SPL is distributed in the hope that it will be useful, but WITHOUT
|
|
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
|
|
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License
|
|
* for more details.
|
|
*
|
|
* You should have received a copy of the GNU General Public License along
|
|
* with the SPL. If not, see <http://www.gnu.org/licenses/>.
|
|
\*****************************************************************************/
|
|
|
|
#ifndef _SPL_MM_COMPAT_H
|
|
#define _SPL_MM_COMPAT_H
|
|
|
|
#include <linux/mm.h>
|
|
#include <linux/fs.h>
|
|
|
|
/*
|
|
* Linux 2.6.31 API Change.
|
|
* Individual pages_{min,low,high} moved in to watermark array.
|
|
*/
|
|
#ifndef min_wmark_pages
|
|
#define min_wmark_pages(z) (z->pages_min)
|
|
#endif
|
|
|
|
#ifndef low_wmark_pages
|
|
#define low_wmark_pages(z) (z->pages_low)
|
|
#endif
|
|
|
|
#ifndef high_wmark_pages
|
|
#define high_wmark_pages(z) (z->pages_high)
|
|
#endif
|
|
|
|
/*
|
|
* 2.6.37 API compat,
|
|
* The function invalidate_inodes() is no longer exported by the kernel.
|
|
* The prototype however is still available which means it is safe
|
|
* to acquire the symbol's address using spl_kallsyms_lookup_name().
|
|
*/
|
|
#ifndef HAVE_INVALIDATE_INODES
|
|
typedef int (*invalidate_inodes_t)(struct super_block *sb);
|
|
extern invalidate_inodes_t invalidate_inodes_fn;
|
|
#define invalidate_inodes(sb) invalidate_inodes_fn(sb)
|
|
#endif /* HAVE_INVALIDATE_INODES */
|
|
|
|
/*
|
|
* 2.6.xx API compat,
|
|
* There currently exists no exposed API to partially shrink the dcache.
|
|
* The expected mechanism to shrink the cache is a registered shrinker
|
|
* which is called during memory pressure.
|
|
*/
|
|
#ifndef HAVE_SHRINK_DCACHE_MEMORY
|
|
# ifdef HAVE_3ARGS_SHRINKER_CALLBACK
|
|
typedef int (*shrink_dcache_memory_t)(struct shrinker *, int, gfp_t);
|
|
extern shrink_dcache_memory_t shrink_dcache_memory_fn;
|
|
# define shrink_dcache_memory(nr, gfp) shrink_dcache_memory_fn(NULL, nr, gfp)
|
|
# else
|
|
typedef int (*shrink_dcache_memory_t)(int, gfp_t);
|
|
extern shrink_dcache_memory_t shrink_dcache_memory_fn;
|
|
# define shrink_dcache_memory(nr, gfp) shrink_dcache_memory_fn(nr, gfp)
|
|
# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
|
|
#endif /* HAVE_SHRINK_DCACHE_MEMORY */
|
|
|
|
/*
|
|
* 2.6.xx API compat,
|
|
* There currently exists no exposed API to partially shrink the icache.
|
|
* The expected mechanism to shrink the cache is a registered shrinker
|
|
* which is called during memory pressure.
|
|
*/
|
|
#ifndef HAVE_SHRINK_ICACHE_MEMORY
|
|
# ifdef HAVE_3ARGS_SHRINKER_CALLBACK
|
|
typedef int (*shrink_icache_memory_t)(struct shrinker *, int, gfp_t);
|
|
extern shrink_icache_memory_t shrink_icache_memory_fn;
|
|
# define shrink_icache_memory(nr, gfp) shrink_icache_memory_fn(NULL, nr, gfp)
|
|
# else
|
|
typedef int (*shrink_icache_memory_t)(int, gfp_t);
|
|
extern shrink_icache_memory_t shrink_icache_memory_fn;
|
|
# define shrink_icache_memory(nr, gfp) shrink_icache_memory_fn(nr, gfp)
|
|
# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
|
|
#endif /* HAVE_SHRINK_ICACHE_MEMORY */
|
|
|
|
#ifdef HAVE_SET_SHRINKER
|
|
typedef struct spl_shrinker {
|
|
struct shrinker *shrinker;
|
|
shrinker_t fn;
|
|
int seeks;
|
|
} spl_shrinker_t;
|
|
|
|
static inline void
|
|
spl_register_shrinker(spl_shrinker_t *ss)
|
|
{
|
|
ss->shrinker = set_shrinker(ss->seeks, ss->fn);
|
|
}
|
|
|
|
static inline void
|
|
spl_unregister_shrinker(spl_shrinker_t *ss)
|
|
{
|
|
remove_shrinker(ss->shrinker);
|
|
}
|
|
|
|
# define SPL_SHRINKER_DECLARE(s, x, y) \
|
|
static spl_shrinker_t s = { .shrinker = NULL, .fn = x, .seeks = y }
|
|
# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
|
|
static int fn(int y, unsigned int z)
|
|
# define spl_exec_shrinker(ss, nr, gfp) \
|
|
((spl_shrinker_t *)ss)->fn(nr, gfp)
|
|
|
|
#else /* HAVE_SET_SHRINKER */
|
|
|
|
# define spl_register_shrinker(x) register_shrinker(x)
|
|
# define spl_unregister_shrinker(x) unregister_shrinker(x)
|
|
# define SPL_SHRINKER_DECLARE(s, x, y) \
|
|
static struct shrinker s = { .shrink = x, .seeks = y }
|
|
|
|
# ifdef HAVE_3ARGS_SHRINKER_CALLBACK
|
|
# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
|
|
static int fn(struct shrinker *x, int y, unsigned int z)
|
|
# define spl_exec_shrinker(ss, nr, gfp) \
|
|
((struct shrinker *)ss)->shrink(NULL, nr, gfp)
|
|
# else /* HAVE_3ARGS_SHRINKER_CALLBACK */
|
|
# define SPL_SHRINKER_CALLBACK_PROTO(fn, x, y, z) \
|
|
static int fn(int y, unsigned int z)
|
|
# define spl_exec_shrinker(ss, nr, gfp) \
|
|
((struct shrinker *)ss)->shrink(nr, gfp)
|
|
# endif /* HAVE_3ARGS_SHRINKER_CALLBACK */
|
|
#endif /* HAVE_SET_SHRINKER */
|
|
|
|
#endif /* SPL_MM_COMPAT_H */
|