drop_caches.c

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    1 /*
    2  * Implement the manual drop-all-pagecache function
    3  */
    4 
    5 #include <linux/kernel.h>
    6 #include <linux/mm.h>
    7 #include <linux/fs.h>
    8 #include <linux/writeback.h>
    9 #include <linux/sysctl.h>
   10 #include <linux/gfp.h>
   11 #include "internal.h"
   12 
   13 /* A global variable is a bit ugly, but it keeps the code simple */
   14 int sysctl_drop_caches;
   15 
   16 static void drop_pagecache_sb(struct super_block *sb, void *unused)
   17 {
   18         struct inode *inode, *toput_inode = NULL;
   19 
   20         spin_lock(&inode_sb_list_lock);
   21         list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
   22                 spin_lock(&inode->i_lock);
   23                 if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) ||
   24                     (inode->i_mapping->nrpages == 0)) {
   25                         spin_unlock(&inode->i_lock);
   26                         continue;
   27                 }
   28                 __iget(inode);
   29                 spin_unlock(&inode->i_lock);
   30                 spin_unlock(&inode_sb_list_lock);
   31                 invalidate_mapping_pages(inode->i_mapping, 0, -1);
   32                 iput(toput_inode);
   33                 toput_inode = inode;
   34                 spin_lock(&inode_sb_list_lock);
   35         }
   36         spin_unlock(&inode_sb_list_lock);
   37         iput(toput_inode);
   38 }
   39 
   40 static void drop_slab(void)
   41 {
   42         int nr_objects;
   43         struct shrink_control shrink = {
   44                 .gfp_mask = GFP_KERNEL,
   45         };
   46 
   47         do {
   48                 nr_objects = shrink_slab(&shrink, 1000, 1000);
   49         } while (nr_objects > 10);
   50 }
   51 
   52 int drop_caches_sysctl_handler(ctl_table *table, int write,
   53         void __user *buffer, size_t *length, loff_t *ppos)
   54 {
   55         int ret;
   56 
   57         ret = proc_dointvec_minmax(table, write, buffer, length, ppos);
   58         if (ret)
   59                 return ret;
   60         if (write) {
   61                 if (sysctl_drop_caches & 1)
   62                         iterate_supers(drop_pagecache_sb, NULL);
   63                 if (sysctl_drop_caches & 2)
   64                         drop_slab();
   65         }
   66         return 0;
   67 }

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FreeBSD/Linux Kernel Cross Reference sys/fs/drop_caches.c

FreeBSD/Linux Kernel Cross Reference
sys/fs/drop_caches.c