Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752721AbbD0DCy (ORCPT ); Sun, 26 Apr 2015 23:02:54 -0400 Received: from shonan.sfc.wide.ad.jp ([203.178.142.130]:44250 "EHLO mail.sfc.wide.ad.jp" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752394AbbD0DBH (ORCPT ); Sun, 26 Apr 2015 23:01:07 -0400 From: Hajime Tazaki To: linux-arch@vger.kernel.org Cc: Hajime Tazaki , Arnd Bergmann , Jonathan Corbet , Christoph Lameter , Jekka Enberg , Javid Rientjes , Joonsoo Kim , Jndrew Morton , linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org, netdev@vger.kernel.org, linux-mm@kvack.org, Jeff Dike , Richard Weinberger , Rusty Russell , Ryo Nakamura , Christoph Paasch , Mathieu Lacage , libos-nuse@googlegroups.com Subject: [PATCH v4 06/10] lib: sysctl handling (kernel glue code) Date: Mon, 27 Apr 2015 12:00:14 +0900 Message-Id: <1430103618-10832-7-git-send-email-tazaki@sfc.wide.ad.jp> X-Mailer: git-send-email 2.1.0 In-Reply-To: <1430103618-10832-1-git-send-email-tazaki@sfc.wide.ad.jp> References: <1429450104-47619-1-git-send-email-tazaki@sfc.wide.ad.jp> <1430103618-10832-1-git-send-email-tazaki@sfc.wide.ad.jp> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 8376 Lines: 293 This interacts with fs/proc_fs.c for sysctl-like interface registed via lib_init() API. Signed-off-by: Hajime Tazaki --- arch/lib/sysctl.c | 270 ++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 270 insertions(+) create mode 100644 arch/lib/sysctl.c diff --git a/arch/lib/sysctl.c b/arch/lib/sysctl.c new file mode 100644 index 0000000..5f08f9f --- /dev/null +++ b/arch/lib/sysctl.c @@ -0,0 +1,270 @@ +/* + * sysctl wrapper for library version of Linux kernel + * Copyright (c) 2015 INRIA, Hajime Tazaki + * + * Author: Mathieu Lacage + * Hajime Tazaki + */ + +#include +#include +#include +#include +#include +#include "sim-assert.h" +#include "sim-types.h" + +int drop_caches_sysctl_handler(struct ctl_table *table, int write, + void *buffer, size_t *length, loff_t *ppos) +{ + lib_assert(false); + return 0; +} +int lowmem_reserve_ratio_sysctl_handler(struct ctl_table *table, int write, + void *buffer, size_t *length, + loff_t *ppos) +{ + lib_assert(false); + return 0; +} +int min_free_kbytes_sysctl_handler(struct ctl_table *table, int write, + void *buffer, size_t *length, loff_t *ppos) +{ + lib_assert(false); + return 0; +} + +int percpu_pagelist_fraction_sysctl_handler(struct ctl_table *table, int write, + void *buffer, size_t *length, + loff_t *ppos) +{ + lib_assert(false); + return 0; +} +int dirty_background_ratio_handler(struct ctl_table *table, int write, + void *buffer, size_t *lenp, + loff_t *ppos) +{ + lib_assert(false); + return 0; +} +int dirty_background_bytes_handler(struct ctl_table *table, int write, + void *buffer, size_t *lenp, + loff_t *ppos) +{ + lib_assert(false); + return 0; +} +int dirty_ratio_handler(struct ctl_table *table, int write, + void *buffer, size_t *lenp, + loff_t *ppos) +{ + lib_assert(false); + return 0; +} +int dirty_bytes_handler(struct ctl_table *table, int write, + void *buffer, size_t *lenp, + loff_t *ppos) +{ + lib_assert(false); + return 0; +} +int dirty_writeback_centisecs_handler(struct ctl_table *table, int write, + void *buffer, size_t *length, + loff_t *ppos) +{ + lib_assert(false); + return 0; +} +int scan_unevictable_handler(struct ctl_table *table, int write, + void __user *buffer, + size_t *length, loff_t *ppos) +{ + lib_assert(false); + return 0; +} +int sched_rt_handler(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, + loff_t *ppos) +{ + lib_assert(false); + return 0; +} + +int sysctl_overcommit_memory = OVERCOMMIT_GUESS; +int sysctl_overcommit_ratio = 50; +int sysctl_panic_on_oom = 0; +int sysctl_oom_dump_tasks = 0; +int sysctl_oom_kill_allocating_task = 0; +int sysctl_nr_trim_pages = 0; +int sysctl_drop_caches = 0; +int sysctl_lowmem_reserve_ratio[MAX_NR_ZONES - 1] = { 32 }; +unsigned int sysctl_sched_child_runs_first = 0; +unsigned int sysctl_sched_compat_yield = 0; +unsigned int sysctl_sched_rt_period = 1000000; +int sysctl_sched_rt_runtime = 950000; + +int vm_highmem_is_dirtyable; +unsigned long vm_dirty_bytes = 0; +int vm_dirty_ratio = 20; +int dirty_background_ratio = 10; +unsigned int dirty_expire_interval = 30 * 100; +unsigned int dirty_writeback_interval = 5 * 100; +unsigned long dirty_background_bytes = 0; +int percpu_pagelist_fraction = 0; +int panic_timeout = 0; +int panic_on_oops = 0; +int printk_delay_msec = 0; +int panic_on_warn = 0; +DEFINE_RATELIMIT_STATE(printk_ratelimit_state, 5 * HZ, 10); + +#define RESERVED_PIDS 300 +int pid_max = PID_MAX_DEFAULT; +int pid_max_min = RESERVED_PIDS + 1; +int pid_max_max = PID_MAX_LIMIT; +int min_free_kbytes = 1024; +int max_threads = 100; +int laptop_mode = 0; + +#define DEFAULT_MESSAGE_LOGLEVEL 4 +#define MINIMUM_CONSOLE_LOGLEVEL 1 +#define DEFAULT_CONSOLE_LOGLEVEL 7 +int console_printk[4] = { + DEFAULT_CONSOLE_LOGLEVEL, /* console_loglevel */ + DEFAULT_MESSAGE_LOGLEVEL, /* default_message_loglevel */ + MINIMUM_CONSOLE_LOGLEVEL, /* minimum_console_loglevel */ + DEFAULT_CONSOLE_LOGLEVEL, /* default_console_loglevel */ +}; + +int print_fatal_signals = 0; +unsigned int core_pipe_limit = 0; +int core_uses_pid = 0; +int vm_swappiness = 60; +int nr_pdflush_threads = 0; +unsigned long scan_unevictable_pages = 0; +int suid_dumpable = 0; +int page_cluster = 0; +int block_dump = 0; +int C_A_D = 0; +#include +struct nsproxy init_nsproxy; +#include +char poweroff_cmd[POWEROFF_CMD_PATH_LEN] = "/sbin/poweroff"; +unsigned long sysctl_user_reserve_kbytes __read_mostly = 1UL << 17; /* 128MB */ +unsigned long sysctl_admin_reserve_kbytes __read_mostly = 1UL << 13; /* 8MB */ + +int pdflush_proc_obsolete(struct ctl_table *table, int write, + void __user *buffer, size_t *lenp, loff_t *ppos) +{ + return nr_pdflush_threads; +} +#include + +/** + * Honestly, I don't understand half of that code. + * It was modeled after fs/proc/proc_sysctl.c proc_sys_readdir + * + * Me either ;) (Hajime, Jan 2013) + */ + +/* from proc_sysctl.c (XXX) */ +extern struct ctl_table_root sysctl_table_root; +void ctl_table_first_entry(struct ctl_dir *dir, + struct ctl_table_header **phead, struct ctl_table **pentry); +void ctl_table_next_entry(struct ctl_table_header **phead, struct ctl_table **pentry); +struct ctl_table *ctl_table_find_entry(struct ctl_table_header **phead, + struct ctl_dir *dir, const char *name, + int namelen); +struct ctl_dir *ctl_table_xlate_dir(struct ctl_table_set *set, struct ctl_dir *dir); +/* for init_net (XXX, should be fixed) */ +#include + +static void iterate_table_recursive(const struct SimSysIterator *iter, + struct ctl_table_header *head) +{ + struct ctl_table *entry; + + for (entry = head->ctl_table; entry->procname; entry++) { + bool may_read = (head->ctl_table->mode & MAY_READ); + bool may_write = (head->ctl_table->mode & MAY_WRITE); + int flags = 0; + + flags |= may_read ? SIM_SYS_FILE_READ : 0; + flags |= may_write ? SIM_SYS_FILE_WRITE : 0; + iter->report_file(iter, entry->procname, flags, + (struct SimSysFile *)entry); + } +} + + +static void iterate_recursive(const struct SimSysIterator *iter, + struct ctl_table_header *head) +{ + struct ctl_table_header *h = NULL; + struct ctl_table *entry; + struct ctl_dir *ctl_dir; + + ctl_dir = container_of(head, struct ctl_dir, header); + for (ctl_table_first_entry(ctl_dir, &h, &entry); h; + ctl_table_next_entry(&h, &entry)) { + struct ctl_dir *dir; + int ret; + const char *procname; + + /* copy from sysctl_follow_link () */ + if (S_ISLNK(entry->mode)) { + dir = ctl_table_xlate_dir(&init_net.sysctls, h->parent); + if (IS_ERR(dir)) { + ret = PTR_ERR(dir); + lib_assert(false); + } else { + procname = entry->procname; + h = NULL; + entry = + ctl_table_find_entry(&h, dir, procname, + strlen(procname)); + ret = -ENOENT; + } + } + + if (S_ISDIR(entry->mode)) { + iter->report_start_dir(iter, entry->procname); + iterate_recursive(iter, h); + iter->report_end_dir(iter); + } else + iterate_table_recursive(iter, h); + } + +} + + +void lib_sys_iterate_files(const struct SimSysIterator *iter) +{ + struct ctl_table_header *root = + &sysctl_table_root.default_set.dir.header; + + iterate_recursive(iter, root); +} + +int lib_sys_file_read(const struct SimSysFile *file, char *buffer, int size, + int offset) +{ + struct ctl_table *table = (struct ctl_table *)file; + loff_t ppos = offset; + size_t result = size; + int error; + + error = table->proc_handler(table, 0, buffer, &result, &ppos); + return result; +} +int lib_sys_file_write(const struct SimSysFile *file, const char *buffer, + int size, int offset) +{ + struct ctl_table *table = (struct ctl_table *)file; + loff_t ppos = offset; + size_t result = size; + int error; + + error = table->proc_handler(table, 1, (char *)buffer, &result, &ppos); + return result; +} -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/