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v0.8.1
v0.8.1
https://github.com/torvalds/linux
Revision a66b34b26fe1b0983c6d91b6381df806cd98886e authored by Adrian Bunk on 09 June 2008, 23:22:24 UTC, committed by Len Brown on 11 June 2008, 23:13:46 UTC
This patch adds a proper prototype for acpi_processor_tstate_has_changed() in include/acpi/processor.h Signed-off-by: Adrian Bunk <bunk@kernel.org> Cc: Len Brown <lenb@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Len Brown <len.brown@intel.com>
1 parent 39b8931
Tip revision: a66b34b26fe1b0983c6d91b6381df806cd98886e authored by Adrian Bunk on 09 June 2008, 23:22:24 UTC
proper prototype for acpi_processor_tstate_has_changed()
proper prototype for acpi_processor_tstate_has_changed()
Tip revision: a66b34b
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, *toput_inode = NULL;
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;
if (inode->i_mapping->nrpages == 0)
continue;
__iget(inode);
spin_unlock(&inode_lock);
__invalidate_mapping_pages(inode->i_mapping, 0, -1, true);
iput(toput_inode);
toput_inode = inode;
spin_lock(&inode_lock);
}
spin_unlock(&inode_lock);
iput(toput_inode);
}
static 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);
}
static 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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