Merge branch 'for-3.9-async' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq
Pull async changes from Tejun Heo:
"These are followups for the earlier deadlock issue involving async
ending up waiting for itself through block requesting module[1]. The
following changes are made by these commits.
- Instead of requesting default elevator on each request_queue init,
block now requests it once early during boot.
- Kmod triggers warning if invoked from an async worker.
- Async synchronization implementation has been reimplemented. It's
a lot simpler now."
* 'for-3.9-async' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/wq:
async: initialise list heads to fix crash
async: replace list of active domains with global list of pending items
async: keep pending tasks on async_domain and remove async_pending
async: use ULLONG_MAX for infinity cookie value
async: bring sanity to the use of words domain and running
async, kmod: warn on synchronous request_module() from async workers
block: don't request module during elevator init
init, block: try to load default elevator module early during boot
This commit is contained in:
Linus Torvalds
commit
ece8e0b2f9
9 changed files with 132 additions and 111 deletions
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@ -100,14 +100,14 @@ static void elevator_put(struct elevator_type *e)
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module_put(e->elevator_owner);
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}
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static struct elevator_type *elevator_get(const char *name)
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static struct elevator_type *elevator_get(const char *name, bool try_loading)
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{
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struct elevator_type *e;
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spin_lock(&elv_list_lock);
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e = elevator_find(name);
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if (!e) {
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if (!e && try_loading) {
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spin_unlock(&elv_list_lock);
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request_module("%s-iosched", name);
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spin_lock(&elv_list_lock);
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@ -136,6 +136,22 @@ static int __init elevator_setup(char *str)
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__setup("elevator=", elevator_setup);
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/* called during boot to load the elevator chosen by the elevator param */
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void __init load_default_elevator_module(void)
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{
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struct elevator_type *e;
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if (!chosen_elevator[0])
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return;
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spin_lock(&elv_list_lock);
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e = elevator_find(chosen_elevator);
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spin_unlock(&elv_list_lock);
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if (!e)
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request_module("%s-iosched", chosen_elevator);
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}
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static struct kobj_type elv_ktype;
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static struct elevator_queue *elevator_alloc(struct request_queue *q,
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@ -191,25 +207,30 @@ int elevator_init(struct request_queue *q, char *name)
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q->boundary_rq = NULL;
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if (name) {
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e = elevator_get(name);
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e = elevator_get(name, true);
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if (!e)
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return -EINVAL;
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}
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/*
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* Use the default elevator specified by config boot param or
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* config option. Don't try to load modules as we could be running
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* off async and request_module() isn't allowed from async.
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*/
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if (!e && *chosen_elevator) {
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e = elevator_get(chosen_elevator);
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e = elevator_get(chosen_elevator, false);
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if (!e)
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printk(KERN_ERR "I/O scheduler %s not found\n",
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chosen_elevator);
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}
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if (!e) {
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e = elevator_get(CONFIG_DEFAULT_IOSCHED);
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e = elevator_get(CONFIG_DEFAULT_IOSCHED, false);
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if (!e) {
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printk(KERN_ERR
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"Default I/O scheduler not found. " \
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"Using noop.\n");
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e = elevator_get("noop");
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e = elevator_get("noop", false);
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}
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}
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@ -951,7 +972,7 @@ int elevator_change(struct request_queue *q, const char *name)
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return -ENXIO;
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strlcpy(elevator_name, name, sizeof(elevator_name));
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e = elevator_get(strstrip(elevator_name));
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e = elevator_get(strstrip(elevator_name), true);
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if (!e) {
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printk(KERN_ERR "elevator: type %s not found\n", elevator_name);
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return -EINVAL;
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@ -19,8 +19,7 @@ typedef u64 async_cookie_t;
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typedef void (async_func_ptr) (void *data, async_cookie_t cookie);
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struct async_domain {
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struct list_head node;
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struct list_head domain;
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int count;
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struct list_head pending;
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unsigned registered:1;
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};
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@ -29,8 +28,7 @@ struct async_domain {
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*/
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#define ASYNC_DOMAIN(_name) \
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struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \
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.domain = LIST_HEAD_INIT(_name.domain), \
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.count = 0, \
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.pending = LIST_HEAD_INIT(_name.pending), \
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.registered = 1 }
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/*
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@ -39,8 +37,7 @@ struct async_domain {
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*/
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#define ASYNC_DOMAIN_EXCLUSIVE(_name) \
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struct async_domain _name = { .node = LIST_HEAD_INIT(_name.node), \
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.domain = LIST_HEAD_INIT(_name.domain), \
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.count = 0, \
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.pending = LIST_HEAD_INIT(_name.pending), \
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.registered = 0 }
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extern async_cookie_t async_schedule(async_func_ptr *ptr, void *data);
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@ -138,6 +138,7 @@ extern void elv_drain_elevator(struct request_queue *);
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/*
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* io scheduler registration
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*/
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extern void __init load_default_elevator_module(void);
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extern int elv_register(struct elevator_type *);
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extern void elv_unregister(struct elevator_type *);
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@ -206,5 +207,9 @@ enum {
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INIT_LIST_HEAD(&(rq)->csd.list); \
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} while (0)
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#else /* CONFIG_BLOCK */
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static inline void load_default_elevator_module(void) { }
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#endif /* CONFIG_BLOCK */
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#endif
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@ -153,6 +153,7 @@ extern unsigned int reset_devices;
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/* used by init/main.c */
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void setup_arch(char **);
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void prepare_namespace(void);
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void __init load_default_modules(void);
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extern void (*late_time_init)(void);
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@ -61,6 +61,9 @@ static void __init handle_initrd(void)
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sys_mkdir("/old", 0700);
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sys_chdir("/old");
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/* try loading default modules from initrd */
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load_default_modules();
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/*
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* In case that a resume from disk is carried out by linuxrc or one of
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* its children, we need to tell the freezer not to wait for us.
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@ -592,7 +592,7 @@ static int __init populate_rootfs(void)
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initrd_end - initrd_start);
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if (!err) {
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free_initrd();
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return 0;
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goto done;
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} else {
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clean_rootfs();
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unpack_to_rootfs(__initramfs_start, __initramfs_size);
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@ -607,6 +607,7 @@ static int __init populate_rootfs(void)
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sys_close(fd);
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free_initrd();
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}
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done:
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#else
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printk(KERN_INFO "Unpacking initramfs...\n");
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err = unpack_to_rootfs((char *)initrd_start,
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@ -615,6 +616,11 @@ static int __init populate_rootfs(void)
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printk(KERN_EMERG "Initramfs unpacking failed: %s\n", err);
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free_initrd();
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#endif
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/*
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* Try loading default modules from initramfs. This gives
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* us a chance to load before device_initcalls.
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*/
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load_default_modules();
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}
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return 0;
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}
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16
init/main.c
16
init/main.c
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@ -70,6 +70,8 @@
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#include <linux/perf_event.h>
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#include <linux/file.h>
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#include <linux/ptrace.h>
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#include <linux/blkdev.h>
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#include <linux/elevator.h>
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#include <asm/io.h>
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#include <asm/bugs.h>
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@ -794,6 +796,17 @@ static void __init do_pre_smp_initcalls(void)
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do_one_initcall(*fn);
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}
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/*
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* This function requests modules which should be loaded by default and is
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* called twice right after initrd is mounted and right before init is
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* exec'd. If such modules are on either initrd or rootfs, they will be
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* loaded before control is passed to userland.
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*/
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void __init load_default_modules(void)
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{
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load_default_elevator_module();
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}
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static int run_init_process(const char *init_filename)
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{
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argv_init[0] = init_filename;
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@ -900,4 +913,7 @@ static noinline void __init kernel_init_freeable(void)
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* we're essentially up and running. Get rid of the
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* initmem segments and start the user-mode stuff..
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*/
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/* rootfs is available now, try loading default modules */
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load_default_modules();
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}
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157
kernel/async.c
157
kernel/async.c
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@ -61,63 +61,48 @@ asynchronous and synchronous parts of the kernel.
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static async_cookie_t next_cookie = 1;
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#define MAX_WORK 32768
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#define MAX_WORK 32768
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#define ASYNC_COOKIE_MAX ULLONG_MAX /* infinity cookie */
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static LIST_HEAD(async_pending);
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static ASYNC_DOMAIN(async_running);
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static LIST_HEAD(async_domains);
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static LIST_HEAD(async_global_pending); /* pending from all registered doms */
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static ASYNC_DOMAIN(async_dfl_domain);
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static DEFINE_SPINLOCK(async_lock);
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static DEFINE_MUTEX(async_register_mutex);
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struct async_entry {
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struct list_head list;
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struct list_head domain_list;
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struct list_head global_list;
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struct work_struct work;
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async_cookie_t cookie;
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async_func_ptr *func;
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void *data;
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struct async_domain *running;
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struct async_domain *domain;
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};
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static DECLARE_WAIT_QUEUE_HEAD(async_done);
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static atomic_t entry_count;
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/*
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* MUST be called with the lock held!
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*/
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static async_cookie_t __lowest_in_progress(struct async_domain *running)
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{
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async_cookie_t first_running = next_cookie; /* infinity value */
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async_cookie_t first_pending = next_cookie; /* ditto */
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struct async_entry *entry;
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/*
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* Both running and pending lists are sorted but not disjoint.
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* Take the first cookies from both and return the min.
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*/
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if (!list_empty(&running->domain)) {
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entry = list_first_entry(&running->domain, typeof(*entry), list);
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first_running = entry->cookie;
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}
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list_for_each_entry(entry, &async_pending, list) {
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if (entry->running == running) {
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first_pending = entry->cookie;
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break;
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}
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}
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return min(first_running, first_pending);
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}
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static async_cookie_t lowest_in_progress(struct async_domain *running)
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static async_cookie_t lowest_in_progress(struct async_domain *domain)
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{
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struct async_entry *first = NULL;
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async_cookie_t ret = ASYNC_COOKIE_MAX;
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unsigned long flags;
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async_cookie_t ret;
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spin_lock_irqsave(&async_lock, flags);
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ret = __lowest_in_progress(running);
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if (domain) {
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if (!list_empty(&domain->pending))
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first = list_first_entry(&domain->pending,
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struct async_entry, domain_list);
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} else {
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if (!list_empty(&async_global_pending))
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first = list_first_entry(&async_global_pending,
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struct async_entry, global_list);
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}
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if (first)
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ret = first->cookie;
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spin_unlock_irqrestore(&async_lock, flags);
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return ret;
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}
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@ -129,20 +114,10 @@ static void async_run_entry_fn(struct work_struct *work)
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{
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struct async_entry *entry =
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container_of(work, struct async_entry, work);
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struct async_entry *pos;
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unsigned long flags;
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ktime_t uninitialized_var(calltime), delta, rettime;
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struct async_domain *running = entry->running;
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/* 1) move self to the running queue, make sure it stays sorted */
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spin_lock_irqsave(&async_lock, flags);
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list_for_each_entry_reverse(pos, &running->domain, list)
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if (entry->cookie < pos->cookie)
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break;
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list_move_tail(&entry->list, &pos->list);
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spin_unlock_irqrestore(&async_lock, flags);
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/* 2) run (and print duration) */
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/* 1) run (and print duration) */
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if (initcall_debug && system_state == SYSTEM_BOOTING) {
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printk(KERN_DEBUG "calling %lli_%pF @ %i\n",
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(long long)entry->cookie,
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@ -159,23 +134,22 @@ static void async_run_entry_fn(struct work_struct *work)
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(long long)ktime_to_ns(delta) >> 10);
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}
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/* 3) remove self from the running queue */
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/* 2) remove self from the pending queues */
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spin_lock_irqsave(&async_lock, flags);
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list_del(&entry->list);
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if (running->registered && --running->count == 0)
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list_del_init(&running->node);
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list_del_init(&entry->domain_list);
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list_del_init(&entry->global_list);
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|
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/* 4) free the entry */
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/* 3) free the entry */
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kfree(entry);
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atomic_dec(&entry_count);
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|
||||
spin_unlock_irqrestore(&async_lock, flags);
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|
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/* 5) wake up any waiters */
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||||
/* 4) wake up any waiters */
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||||
wake_up(&async_done);
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||||
}
|
||||
|
||||
static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct async_domain *running)
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static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct async_domain *domain)
|
||||
{
|
||||
struct async_entry *entry;
|
||||
unsigned long flags;
|
||||
|
|
@ -198,16 +172,22 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct a
|
|||
ptr(data, newcookie);
|
||||
return newcookie;
|
||||
}
|
||||
INIT_LIST_HEAD(&entry->domain_list);
|
||||
INIT_LIST_HEAD(&entry->global_list);
|
||||
INIT_WORK(&entry->work, async_run_entry_fn);
|
||||
entry->func = ptr;
|
||||
entry->data = data;
|
||||
entry->running = running;
|
||||
entry->domain = domain;
|
||||
|
||||
spin_lock_irqsave(&async_lock, flags);
|
||||
|
||||
/* allocate cookie and queue */
|
||||
newcookie = entry->cookie = next_cookie++;
|
||||
list_add_tail(&entry->list, &async_pending);
|
||||
if (running->registered && running->count++ == 0)
|
||||
list_add_tail(&running->node, &async_domains);
|
||||
|
||||
list_add_tail(&entry->domain_list, &domain->pending);
|
||||
if (domain->registered)
|
||||
list_add_tail(&entry->global_list, &async_global_pending);
|
||||
|
||||
atomic_inc(&entry_count);
|
||||
spin_unlock_irqrestore(&async_lock, flags);
|
||||
|
||||
|
|
@ -230,7 +210,7 @@ static async_cookie_t __async_schedule(async_func_ptr *ptr, void *data, struct a
|
|||
*/
|
||||
async_cookie_t async_schedule(async_func_ptr *ptr, void *data)
|
||||
{
|
||||
return __async_schedule(ptr, data, &async_running);
|
||||
return __async_schedule(ptr, data, &async_dfl_domain);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(async_schedule);
|
||||
|
||||
|
|
@ -238,18 +218,18 @@ EXPORT_SYMBOL_GPL(async_schedule);
|
|||
* async_schedule_domain - schedule a function for asynchronous execution within a certain domain
|
||||
* @ptr: function to execute asynchronously
|
||||
* @data: data pointer to pass to the function
|
||||
* @running: running list for the domain
|
||||
* @domain: the domain
|
||||
*
|
||||
* Returns an async_cookie_t that may be used for checkpointing later.
|
||||
* @running may be used in the async_synchronize_*_domain() functions
|
||||
* to wait within a certain synchronization domain rather than globally.
|
||||
* A synchronization domain is specified via the running queue @running to use.
|
||||
* Note: This function may be called from atomic or non-atomic contexts.
|
||||
* @domain may be used in the async_synchronize_*_domain() functions to
|
||||
* wait within a certain synchronization domain rather than globally. A
|
||||
* synchronization domain is specified via @domain. Note: This function
|
||||
* may be called from atomic or non-atomic contexts.
|
||||
*/
|
||||
async_cookie_t async_schedule_domain(async_func_ptr *ptr, void *data,
|
||||
struct async_domain *running)
|
||||
struct async_domain *domain)
|
||||
{
|
||||
return __async_schedule(ptr, data, running);
|
||||
return __async_schedule(ptr, data, domain);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(async_schedule_domain);
|
||||
|
||||
|
|
@ -260,18 +240,7 @@ EXPORT_SYMBOL_GPL(async_schedule_domain);
|
|||
*/
|
||||
void async_synchronize_full(void)
|
||||
{
|
||||
mutex_lock(&async_register_mutex);
|
||||
do {
|
||||
struct async_domain *domain = NULL;
|
||||
|
||||
spin_lock_irq(&async_lock);
|
||||
if (!list_empty(&async_domains))
|
||||
domain = list_first_entry(&async_domains, typeof(*domain), node);
|
||||
spin_unlock_irq(&async_lock);
|
||||
|
||||
async_synchronize_cookie_domain(next_cookie, domain);
|
||||
} while (!list_empty(&async_domains));
|
||||
mutex_unlock(&async_register_mutex);
|
||||
async_synchronize_full_domain(NULL);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(async_synchronize_full);
|
||||
|
||||
|
|
@ -286,51 +255,45 @@ EXPORT_SYMBOL_GPL(async_synchronize_full);
|
|||
*/
|
||||
void async_unregister_domain(struct async_domain *domain)
|
||||
{
|
||||
mutex_lock(&async_register_mutex);
|
||||
spin_lock_irq(&async_lock);
|
||||
WARN_ON(!domain->registered || !list_empty(&domain->node) ||
|
||||
!list_empty(&domain->domain));
|
||||
WARN_ON(!domain->registered || !list_empty(&domain->pending));
|
||||
domain->registered = 0;
|
||||
spin_unlock_irq(&async_lock);
|
||||
mutex_unlock(&async_register_mutex);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(async_unregister_domain);
|
||||
|
||||
/**
|
||||
* async_synchronize_full_domain - synchronize all asynchronous function within a certain domain
|
||||
* @domain: running list to synchronize on
|
||||
* @domain: the domain to synchronize
|
||||
*
|
||||
* This function waits until all asynchronous function calls for the
|
||||
* synchronization domain specified by the running list @domain have been done.
|
||||
* synchronization domain specified by @domain have been done.
|
||||
*/
|
||||
void async_synchronize_full_domain(struct async_domain *domain)
|
||||
{
|
||||
async_synchronize_cookie_domain(next_cookie, domain);
|
||||
async_synchronize_cookie_domain(ASYNC_COOKIE_MAX, domain);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(async_synchronize_full_domain);
|
||||
|
||||
/**
|
||||
* async_synchronize_cookie_domain - synchronize asynchronous function calls within a certain domain with cookie checkpointing
|
||||
* @cookie: async_cookie_t to use as checkpoint
|
||||
* @running: running list to synchronize on
|
||||
* @domain: the domain to synchronize (%NULL for all registered domains)
|
||||
*
|
||||
* This function waits until all asynchronous function calls for the
|
||||
* synchronization domain specified by running list @running submitted
|
||||
* prior to @cookie have been done.
|
||||
* synchronization domain specified by @domain submitted prior to @cookie
|
||||
* have been done.
|
||||
*/
|
||||
void async_synchronize_cookie_domain(async_cookie_t cookie, struct async_domain *running)
|
||||
void async_synchronize_cookie_domain(async_cookie_t cookie, struct async_domain *domain)
|
||||
{
|
||||
ktime_t uninitialized_var(starttime), delta, endtime;
|
||||
|
||||
if (!running)
|
||||
return;
|
||||
|
||||
if (initcall_debug && system_state == SYSTEM_BOOTING) {
|
||||
printk(KERN_DEBUG "async_waiting @ %i\n", task_pid_nr(current));
|
||||
starttime = ktime_get();
|
||||
}
|
||||
|
||||
wait_event(async_done, lowest_in_progress(running) >= cookie);
|
||||
wait_event(async_done, lowest_in_progress(domain) >= cookie);
|
||||
|
||||
if (initcall_debug && system_state == SYSTEM_BOOTING) {
|
||||
endtime = ktime_get();
|
||||
|
|
@ -352,7 +315,7 @@ EXPORT_SYMBOL_GPL(async_synchronize_cookie_domain);
|
|||
*/
|
||||
void async_synchronize_cookie(async_cookie_t cookie)
|
||||
{
|
||||
async_synchronize_cookie_domain(cookie, &async_running);
|
||||
async_synchronize_cookie_domain(cookie, &async_dfl_domain);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(async_synchronize_cookie);
|
||||
|
||||
|
|
|
|||
|
|
@ -38,6 +38,7 @@
|
|||
#include <linux/suspend.h>
|
||||
#include <linux/rwsem.h>
|
||||
#include <linux/ptrace.h>
|
||||
#include <linux/async.h>
|
||||
#include <asm/uaccess.h>
|
||||
|
||||
#include <trace/events/module.h>
|
||||
|
|
@ -130,6 +131,14 @@ int __request_module(bool wait, const char *fmt, ...)
|
|||
#define MAX_KMOD_CONCURRENT 50 /* Completely arbitrary value - KAO */
|
||||
static int kmod_loop_msg;
|
||||
|
||||
/*
|
||||
* We don't allow synchronous module loading from async. Module
|
||||
* init may invoke async_synchronize_full() which will end up
|
||||
* waiting for this task which already is waiting for the module
|
||||
* loading to complete, leading to a deadlock.
|
||||
*/
|
||||
WARN_ON_ONCE(wait && current_is_async());
|
||||
|
||||
va_start(args, fmt);
|
||||
ret = vsnprintf(module_name, MODULE_NAME_LEN, fmt, args);
|
||||
va_end(args);
|
||||
|
|
|
|||
Loading…
Reference in a new issue