/* * 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); } 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; } ux/net-next.git/refs/?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>refs</a><a class='active' href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch/x86/jaketown/memory.json'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/tools/perf/pmu-events/arch/x86/jaketown/memory.json?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/pmu-events/arch/x86/jaketown/memory.json?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/pmu-events/arch/x86/jaketown/memory.json?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch/x86/jaketown/memory.json'> <input type='hidden' name='id' value='33a48927c193d030c80ecaeb3e021b7ed85f9c78'/><select name='qt'> <option value='grep'>log msg</option> <option value='author'>author</option> <option value='committer'>committer</option> <option value='range'>range</option> </select> <input class='txt' type='search' size='10' name='q' value=''/> <input type='submit' value='search'/> </form> </td></tr></table> <div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>tools</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>perf</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>pmu-events</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>arch</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch/x86?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>x86</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch/x86/jaketown?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>jaketown</a>/<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch/x86/jaketown/memory.json?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78'>memory.json</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/tools/perf/pmu-events/arch/x86/jaketown/memory.json?id=33a48927c193d030c80ecaeb3e021b7ed85f9c78&showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>