cregit-Linux how code gets into the kernel

Release 4.11 fs/drop_caches.c

Directory: fs
 * 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); }


Andrew Morton5838.41%222.22%
Dave Chinner4328.48%222.22%
Jan Kara4328.48%222.22%
Al Viro42.65%111.11%
Nicholas Piggin21.32%111.11%
Mike Waychison10.66%111.11%

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; }


Andrew Morton6348.84%120.00%
Dave Hansen4736.43%120.00%
Petr Holasek129.30%120.00%
Al Viro64.65%120.00%
Joe Perches10.78%120.00%

Overall Contributors

Andrew Morton14447.06%215.38%
Dave Hansen4715.36%17.69%
Dave Chinner4615.03%323.08%
Jan Kara4314.05%215.38%
Petr Holasek123.92%17.69%
Al Viro103.27%17.69%
Nicholas Piggin20.65%17.69%
Mike Waychison10.33%17.69%
Joe Perches10.33%17.69%
Directory: fs
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