Revision c99dcac435cec7aca313638db2f1bc406f29210b authored by Ralf Baechle on 16 August 2007, 11:10:16 UTC, committed by Ralf Baechle on 27 August 2007, 01:16:58 UTC
CC arch/mips/kernel/cpu-bugs64.o arch/mips/kernel/cpu-bugs64.c: In function 'align_mod': arch/mips/kernel/cpu-bugs64.c:23: warning: asm operand 0 probably doesn't match constraints arch/mips/kernel/cpu-bugs64.c:23: warning: asm operand 1 probably doesn't match constraints Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
1 parent 0806133
drop_caches.c
/*
* Implement the manual drop-all-pagecache function
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/fs.h>
#include <linux/writeback.h>
#include <linux/sysctl.h>
#include <linux/gfp.h>
/* A global variable is a bit ugly, but it keeps the code simple */
int sysctl_drop_caches;
static void drop_pagecache_sb(struct super_block *sb)
{
struct inode *inode;
spin_lock(&inode_lock);
list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
if (inode->i_state & (I_FREEING|I_WILL_FREE))
continue;
__invalidate_mapping_pages(inode->i_mapping, 0, -1, true);
}
spin_unlock(&inode_lock);
}
void drop_pagecache(void)
{
struct super_block *sb;
spin_lock(&sb_lock);
restart:
list_for_each_entry(sb, &super_blocks, s_list) {
sb->s_count++;
spin_unlock(&sb_lock);
down_read(&sb->s_umount);
if (sb->s_root)
drop_pagecache_sb(sb);
up_read(&sb->s_umount);
spin_lock(&sb_lock);
if (__put_super_and_need_restart(sb))
goto restart;
}
spin_unlock(&sb_lock);
}
void drop_slab(void)
{
int nr_objects;
do {
nr_objects = shrink_slab(1000, GFP_KERNEL, 1000);
} while (nr_objects > 10);
}
int drop_caches_sysctl_handler(ctl_table *table, int write,
struct file *file, void __user *buffer, size_t *length, loff_t *ppos)
{
proc_dointvec_minmax(table, write, file, buffer, length, ppos);
if (write) {
if (sysctl_drop_caches & 1)
drop_pagecache();
if (sysctl_drop_caches & 2)
drop_slab();
}
return 0;
}
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