mirror of
https://git.proxmox.com/git/mirror_zfs.git
synced 2024-11-18 02:20:59 +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.
47 lines
1.8 KiB
C
47 lines
1.8 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_DNLC_H
|
|
#define _SPL_DNLC_H
|
|
|
|
/*
|
|
* Reduce the dcache and icache then reap the free'd slabs. Note the
|
|
* interface takes a reclaim percentage but we don't have easy access to
|
|
* the total number of entries to calculate the reclaim count. However,
|
|
* in practice this doesn't need to be even close to correct. We simply
|
|
* need to reclaim some useful fraction of the cache. The caller can
|
|
* determine if more needs to be done.
|
|
*/
|
|
static inline void
|
|
dnlc_reduce_cache(void *reduce_percent)
|
|
{
|
|
int nr = (uintptr_t)reduce_percent * 10000;
|
|
|
|
shrink_dcache_memory(nr, GFP_KERNEL);
|
|
shrink_icache_memory(nr, GFP_KERNEL);
|
|
kmem_reap();
|
|
}
|
|
|
|
#endif /* SPL_DNLC_H */
|