Release 4.11 fs/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>
#include "internal.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, void *unused)
{
	struct inode *inode, *toput_inode = NULL;

	spin_lock(&sb->s_inode_list_lock);
	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
		spin_lock(&inode->i_lock);
		if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
		    (inode->i_mapping->nrpages == 0)) {
			spin_unlock(&inode->i_lock);
			continue;
		}
		__iget(inode);
		spin_unlock(&inode->i_lock);
		spin_unlock(&sb->s_inode_list_lock);

		invalidate_mapping_pages(inode->i_mapping, 0, -1);
		iput(toput_inode);
		toput_inode = inode;

		spin_lock(&sb->s_inode_list_lock);
	}
	spin_unlock(&sb->s_inode_list_lock);
	iput(toput_inode);
}

Contributors
Person
Tokens
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Commits
CommitProp
Andrew Morton
58
38.41%
2
22.22%
Dave Chinner
43
28.48%
2
22.22%
Jan Kara
43
28.48%
2
22.22%
Al Viro
4
2.65%
1
11.11%
Nicholas Piggin
2
1.32%
1
11.11%
Mike Waychison
1
0.66%
1
11.11%
Total
151
100.00%
9
100.00%



int drop_caches_sysctl_handler(struct ctl_table *table, int write,
	void __user *buffer, size_t *length, loff_t *ppos)
{
	int ret;

	ret = proc_dointvec_minmax(table, write, buffer, length, ppos);
	if (ret)
		return ret;
	if (write) {
		static int stfu;

		if (sysctl_drop_caches & 1) {
			iterate_supers(drop_pagecache_sb, NULL);
			count_vm_event(DROP_PAGECACHE);
		}
		if (sysctl_drop_caches & 2) {
			drop_slab();
			count_vm_event(DROP_SLAB);
		}
		if (!stfu) {
			pr_info("%s (%d): drop_caches: %d\n",
				current->comm, task_pid_nr(current),
				sysctl_drop_caches);
		}
		stfu |= sysctl_drop_caches & 4;
	}
	return 0;
}
Contributors
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Prop
Commits
CommitProp
Andrew Morton
63
48.84%
1
20.00%
Dave Hansen
47
36.43%
1
20.00%
Petr Holasek
12
9.30%
1
20.00%
Al Viro
6
4.65%
1
20.00%
Joe Perches
1
0.78%
1
20.00%
Total
129
100.00%
5
100.00%

Overall Contributors
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Tokens
Prop
Commits
CommitProp
Andrew Morton
144
47.06%
2
15.38%
Dave Hansen
47
15.36%
1
7.69%
Dave Chinner
46
15.03%
3
23.08%
Jan Kara
43
14.05%
2
15.38%
Petr Holasek
12
3.92%
1
7.69%
Al Viro
10
3.27%
1
7.69%
Nicholas Piggin
2
0.65%
1
7.69%
Mike Waychison
1
0.33%
1
7.69%
Joe Perches
1
0.33%
1
7.69%
Total
306
100.00%
13
100.00%
Directory: fs

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