Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/mm/oom_kill.c |
| 3 | * |
| 4 | * Copyright (C) 1998,2000 Rik van Riel |
| 5 | * Thanks go out to Claus Fischer for some serious inspiration and |
| 6 | * for goading me into coding this file... |
| 7 | * |
| 8 | * The routines in this file are used to kill a process when |
Paul Jackson | a49335c | 2005-09-06 15:18:09 -0700 | [diff] [blame] | 9 | * we're seriously out of memory. This gets called from __alloc_pages() |
| 10 | * in mm/page_alloc.c when we really run out of memory. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 11 | * |
| 12 | * Since we won't call these routines often (on a well-configured |
| 13 | * machine) this file will double as a 'coding guide' and a signpost |
| 14 | * for newbie kernel hackers. It features several pointers to major |
| 15 | * kernel subsystems and hints as to where to find out what things do. |
| 16 | */ |
| 17 | |
| 18 | #include <linux/mm.h> |
| 19 | #include <linux/sched.h> |
| 20 | #include <linux/swap.h> |
| 21 | #include <linux/timex.h> |
| 22 | #include <linux/jiffies.h> |
Paul Jackson | ef08e3b | 2005-09-06 15:18:13 -0700 | [diff] [blame] | 23 | #include <linux/cpuset.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | |
KAMEZAWA Hiroyuki | fadd8fb | 2006-06-23 02:03:13 -0700 | [diff] [blame] | 25 | int sysctl_panic_on_oom; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | /* #define DEBUG */ |
| 27 | |
| 28 | /** |
Dave Peterson | 6937a25 | 2006-06-23 02:03:13 -0700 | [diff] [blame^] | 29 | * badness - calculate a numeric value for how bad this task has been |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 30 | * @p: task struct of which task we should calculate |
Paul Jackson | a49335c | 2005-09-06 15:18:09 -0700 | [diff] [blame] | 31 | * @uptime: current uptime in seconds |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | * |
| 33 | * The formula used is relatively simple and documented inline in the |
| 34 | * function. The main rationale is that we want to select a good task |
| 35 | * to kill when we run out of memory. |
| 36 | * |
| 37 | * Good in this context means that: |
| 38 | * 1) we lose the minimum amount of work done |
| 39 | * 2) we recover a large amount of memory |
| 40 | * 3) we don't kill anything innocent of eating tons of memory |
| 41 | * 4) we want to kill the minimum amount of processes (one) |
| 42 | * 5) we try to kill the process the user expects us to kill, this |
| 43 | * algorithm has been meticulously tuned to meet the principle |
| 44 | * of least surprise ... (be careful when you change it) |
| 45 | */ |
| 46 | |
| 47 | unsigned long badness(struct task_struct *p, unsigned long uptime) |
| 48 | { |
| 49 | unsigned long points, cpu_time, run_time, s; |
Andrew Morton | 97c2c9b | 2006-04-18 22:20:38 -0700 | [diff] [blame] | 50 | struct mm_struct *mm; |
| 51 | struct task_struct *child; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 52 | |
Andrew Morton | 97c2c9b | 2006-04-18 22:20:38 -0700 | [diff] [blame] | 53 | task_lock(p); |
| 54 | mm = p->mm; |
| 55 | if (!mm) { |
| 56 | task_unlock(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 57 | return 0; |
Andrew Morton | 97c2c9b | 2006-04-18 22:20:38 -0700 | [diff] [blame] | 58 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 59 | |
| 60 | /* |
| 61 | * The memory size of the process is the basis for the badness. |
| 62 | */ |
Andrew Morton | 97c2c9b | 2006-04-18 22:20:38 -0700 | [diff] [blame] | 63 | points = mm->total_vm; |
| 64 | |
| 65 | /* |
| 66 | * After this unlock we can no longer dereference local variable `mm' |
| 67 | */ |
| 68 | task_unlock(p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | |
| 70 | /* |
| 71 | * Processes which fork a lot of child processes are likely |
Kurt Garloff | 9827b78 | 2006-02-20 18:27:51 -0800 | [diff] [blame] | 72 | * a good choice. We add half the vmsize of the children if they |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | * have an own mm. This prevents forking servers to flood the |
Kurt Garloff | 9827b78 | 2006-02-20 18:27:51 -0800 | [diff] [blame] | 74 | * machine with an endless amount of children. In case a single |
| 75 | * child is eating the vast majority of memory, adding only half |
| 76 | * to the parents will make the child our kill candidate of choice. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 77 | */ |
Andrew Morton | 97c2c9b | 2006-04-18 22:20:38 -0700 | [diff] [blame] | 78 | list_for_each_entry(child, &p->children, sibling) { |
| 79 | task_lock(child); |
| 80 | if (child->mm != mm && child->mm) |
| 81 | points += child->mm->total_vm/2 + 1; |
| 82 | task_unlock(child); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 83 | } |
| 84 | |
| 85 | /* |
| 86 | * CPU time is in tens of seconds and run time is in thousands |
| 87 | * of seconds. There is no particular reason for this other than |
| 88 | * that it turned out to work very well in practice. |
| 89 | */ |
| 90 | cpu_time = (cputime_to_jiffies(p->utime) + cputime_to_jiffies(p->stime)) |
| 91 | >> (SHIFT_HZ + 3); |
| 92 | |
| 93 | if (uptime >= p->start_time.tv_sec) |
| 94 | run_time = (uptime - p->start_time.tv_sec) >> 10; |
| 95 | else |
| 96 | run_time = 0; |
| 97 | |
| 98 | s = int_sqrt(cpu_time); |
| 99 | if (s) |
| 100 | points /= s; |
| 101 | s = int_sqrt(int_sqrt(run_time)); |
| 102 | if (s) |
| 103 | points /= s; |
| 104 | |
| 105 | /* |
| 106 | * Niced processes are most likely less important, so double |
| 107 | * their badness points. |
| 108 | */ |
| 109 | if (task_nice(p) > 0) |
| 110 | points *= 2; |
| 111 | |
| 112 | /* |
| 113 | * Superuser processes are usually more important, so we make it |
| 114 | * less likely that we kill those. |
| 115 | */ |
| 116 | if (cap_t(p->cap_effective) & CAP_TO_MASK(CAP_SYS_ADMIN) || |
| 117 | p->uid == 0 || p->euid == 0) |
| 118 | points /= 4; |
| 119 | |
| 120 | /* |
| 121 | * We don't want to kill a process with direct hardware access. |
| 122 | * Not only could that mess up the hardware, but usually users |
| 123 | * tend to only have this flag set on applications they think |
| 124 | * of as important. |
| 125 | */ |
| 126 | if (cap_t(p->cap_effective) & CAP_TO_MASK(CAP_SYS_RAWIO)) |
| 127 | points /= 4; |
| 128 | |
| 129 | /* |
| 130 | * Adjust the score by oomkilladj. |
| 131 | */ |
| 132 | if (p->oomkilladj) { |
| 133 | if (p->oomkilladj > 0) |
| 134 | points <<= p->oomkilladj; |
| 135 | else |
| 136 | points >>= -(p->oomkilladj); |
| 137 | } |
| 138 | |
| 139 | #ifdef DEBUG |
| 140 | printk(KERN_DEBUG "OOMkill: task %d (%s) got %d points\n", |
| 141 | p->pid, p->comm, points); |
| 142 | #endif |
| 143 | return points; |
| 144 | } |
| 145 | |
| 146 | /* |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 147 | * Types of limitations to the nodes from which allocations may occur |
| 148 | */ |
| 149 | #define CONSTRAINT_NONE 1 |
| 150 | #define CONSTRAINT_MEMORY_POLICY 2 |
| 151 | #define CONSTRAINT_CPUSET 3 |
| 152 | |
| 153 | /* |
| 154 | * Determine the type of allocation constraint. |
| 155 | */ |
| 156 | static inline int constrained_alloc(struct zonelist *zonelist, gfp_t gfp_mask) |
| 157 | { |
| 158 | #ifdef CONFIG_NUMA |
| 159 | struct zone **z; |
| 160 | nodemask_t nodes = node_online_map; |
| 161 | |
| 162 | for (z = zonelist->zones; *z; z++) |
| 163 | if (cpuset_zone_allowed(*z, gfp_mask)) |
| 164 | node_clear((*z)->zone_pgdat->node_id, |
| 165 | nodes); |
| 166 | else |
| 167 | return CONSTRAINT_CPUSET; |
| 168 | |
| 169 | if (!nodes_empty(nodes)) |
| 170 | return CONSTRAINT_MEMORY_POLICY; |
| 171 | #endif |
| 172 | |
| 173 | return CONSTRAINT_NONE; |
| 174 | } |
| 175 | |
| 176 | /* |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | * Simple selection loop. We chose the process with the highest |
| 178 | * number of 'points'. We expect the caller will lock the tasklist. |
| 179 | * |
| 180 | * (not docbooked, we don't want this one cluttering up the manual) |
| 181 | */ |
Kurt Garloff | 9827b78 | 2006-02-20 18:27:51 -0800 | [diff] [blame] | 182 | static struct task_struct *select_bad_process(unsigned long *ppoints) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 183 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | struct task_struct *g, *p; |
| 185 | struct task_struct *chosen = NULL; |
| 186 | struct timespec uptime; |
Kurt Garloff | 9827b78 | 2006-02-20 18:27:51 -0800 | [diff] [blame] | 187 | *ppoints = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 188 | |
| 189 | do_posix_clock_monotonic_gettime(&uptime); |
Paul Jackson | a49335c | 2005-09-06 15:18:09 -0700 | [diff] [blame] | 190 | do_each_thread(g, p) { |
| 191 | unsigned long points; |
| 192 | int releasing; |
| 193 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 194 | /* skip the init task with pid == 1 */ |
Paul Jackson | a49335c | 2005-09-06 15:18:09 -0700 | [diff] [blame] | 195 | if (p->pid == 1) |
| 196 | continue; |
| 197 | if (p->oomkilladj == OOM_DISABLE) |
| 198 | continue; |
Paul Jackson | ef08e3b | 2005-09-06 15:18:13 -0700 | [diff] [blame] | 199 | /* If p's nodes don't overlap ours, it won't help to kill p. */ |
| 200 | if (!cpuset_excl_nodes_overlap(p)) |
| 201 | continue; |
| 202 | |
Paul Jackson | a49335c | 2005-09-06 15:18:09 -0700 | [diff] [blame] | 203 | /* |
Dave Peterson | 6937a25 | 2006-06-23 02:03:13 -0700 | [diff] [blame^] | 204 | * This is in the process of releasing memory so wait for it |
Paul Jackson | a49335c | 2005-09-06 15:18:09 -0700 | [diff] [blame] | 205 | * to finish before killing some other task by mistake. |
| 206 | */ |
| 207 | releasing = test_tsk_thread_flag(p, TIF_MEMDIE) || |
| 208 | p->flags & PF_EXITING; |
| 209 | if (releasing && !(p->flags & PF_DEAD)) |
| 210 | return ERR_PTR(-1UL); |
| 211 | if (p->flags & PF_SWAPOFF) |
| 212 | return p; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 213 | |
Paul Jackson | a49335c | 2005-09-06 15:18:09 -0700 | [diff] [blame] | 214 | points = badness(p, uptime.tv_sec); |
Kurt Garloff | 9827b78 | 2006-02-20 18:27:51 -0800 | [diff] [blame] | 215 | if (points > *ppoints || !chosen) { |
Paul Jackson | a49335c | 2005-09-06 15:18:09 -0700 | [diff] [blame] | 216 | chosen = p; |
Kurt Garloff | 9827b78 | 2006-02-20 18:27:51 -0800 | [diff] [blame] | 217 | *ppoints = points; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 218 | } |
Paul Jackson | a49335c | 2005-09-06 15:18:09 -0700 | [diff] [blame] | 219 | } while_each_thread(g, p); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 220 | return chosen; |
| 221 | } |
| 222 | |
| 223 | /** |
| 224 | * We must be careful though to never send SIGKILL a process with |
| 225 | * CAP_SYS_RAW_IO set, send SIGTERM instead (but it's unlikely that |
| 226 | * we select a process with CAP_SYS_RAW_IO set). |
| 227 | */ |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 228 | static void __oom_kill_task(task_t *p, const char *message) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 229 | { |
| 230 | if (p->pid == 1) { |
| 231 | WARN_ON(1); |
| 232 | printk(KERN_WARNING "tried to kill init!\n"); |
| 233 | return; |
| 234 | } |
| 235 | |
| 236 | task_lock(p); |
| 237 | if (!p->mm || p->mm == &init_mm) { |
| 238 | WARN_ON(1); |
| 239 | printk(KERN_WARNING "tried to kill an mm-less task!\n"); |
| 240 | task_unlock(p); |
| 241 | return; |
| 242 | } |
| 243 | task_unlock(p); |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 244 | printk(KERN_ERR "%s: Killed process %d (%s).\n", |
| 245 | message, p->pid, p->comm); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 246 | |
| 247 | /* |
| 248 | * We give our sacrificial lamb high priority and access to |
| 249 | * all the memory it needs. That way it should be able to |
| 250 | * exit() and clear out its resources quickly... |
| 251 | */ |
| 252 | p->time_slice = HZ; |
| 253 | set_tsk_thread_flag(p, TIF_MEMDIE); |
| 254 | |
| 255 | force_sig(SIGKILL, p); |
| 256 | } |
| 257 | |
Dave Peterson | 0131592 | 2006-04-18 22:20:44 -0700 | [diff] [blame] | 258 | static int oom_kill_task(task_t *p, const char *message) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 259 | { |
Dave Peterson | 0131592 | 2006-04-18 22:20:44 -0700 | [diff] [blame] | 260 | struct mm_struct *mm; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 261 | task_t * g, * q; |
| 262 | |
Dave Peterson | 0131592 | 2006-04-18 22:20:44 -0700 | [diff] [blame] | 263 | mm = p->mm; |
| 264 | |
| 265 | /* WARNING: mm may not be dereferenced since we did not obtain its |
| 266 | * value from get_task_mm(p). This is OK since all we need to do is |
| 267 | * compare mm to q->mm below. |
| 268 | * |
| 269 | * Furthermore, even if mm contains a non-NULL value, p->mm may |
| 270 | * change to NULL at any time since we do not hold task_lock(p). |
| 271 | * However, this is of no concern to us. |
| 272 | */ |
| 273 | |
| 274 | if (mm == NULL || mm == &init_mm) |
| 275 | return 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 276 | |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 277 | __oom_kill_task(p, message); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 278 | /* |
| 279 | * kill all processes that share the ->mm (i.e. all threads), |
| 280 | * but are in a different thread group |
| 281 | */ |
| 282 | do_each_thread(g, q) |
| 283 | if (q->mm == mm && q->tgid != p->tgid) |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 284 | __oom_kill_task(q, message); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 285 | while_each_thread(g, q); |
| 286 | |
Dave Peterson | 0131592 | 2006-04-18 22:20:44 -0700 | [diff] [blame] | 287 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 288 | } |
| 289 | |
Dave Peterson | 0131592 | 2006-04-18 22:20:44 -0700 | [diff] [blame] | 290 | static int oom_kill_process(struct task_struct *p, unsigned long points, |
| 291 | const char *message) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 292 | { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 293 | struct task_struct *c; |
| 294 | struct list_head *tsk; |
| 295 | |
Kurt Garloff | 9827b78 | 2006-02-20 18:27:51 -0800 | [diff] [blame] | 296 | printk(KERN_ERR "Out of Memory: Kill process %d (%s) score %li and " |
| 297 | "children.\n", p->pid, p->comm, points); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 298 | /* Try to kill a child first */ |
| 299 | list_for_each(tsk, &p->children) { |
| 300 | c = list_entry(tsk, struct task_struct, sibling); |
| 301 | if (c->mm == p->mm) |
| 302 | continue; |
Dave Peterson | 0131592 | 2006-04-18 22:20:44 -0700 | [diff] [blame] | 303 | if (!oom_kill_task(c, message)) |
| 304 | return 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | } |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 306 | return oom_kill_task(p, message); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 307 | } |
| 308 | |
| 309 | /** |
Dave Peterson | 6937a25 | 2006-06-23 02:03:13 -0700 | [diff] [blame^] | 310 | * out_of_memory - kill the "best" process when we run out of memory |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | * |
| 312 | * If we run out of memory, we have the choice between either |
| 313 | * killing a random task (bad), letting the system crash (worse) |
| 314 | * OR try to be smart about which process to kill. Note that we |
| 315 | * don't have to be perfect here, we just have to be good. |
| 316 | */ |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 317 | void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 318 | { |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 319 | task_t *p; |
Andrew Morton | d6713e0 | 2006-02-28 16:59:19 -0800 | [diff] [blame] | 320 | unsigned long points = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 321 | |
Anton Blanchard | 4263926 | 2005-07-07 17:56:06 -0700 | [diff] [blame] | 322 | if (printk_ratelimit()) { |
| 323 | printk("oom-killer: gfp_mask=0x%x, order=%d\n", |
| 324 | gfp_mask, order); |
Andrew Morton | b958f7d | 2006-02-01 03:05:51 -0800 | [diff] [blame] | 325 | dump_stack(); |
Anton Blanchard | 4263926 | 2005-07-07 17:56:06 -0700 | [diff] [blame] | 326 | show_mem(); |
| 327 | } |
Janet Morgan | 578c2fd | 2005-06-21 17:14:56 -0700 | [diff] [blame] | 328 | |
Paul Jackson | 505970b | 2006-01-14 13:21:06 -0800 | [diff] [blame] | 329 | cpuset_lock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 330 | read_lock(&tasklist_lock); |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 331 | |
| 332 | /* |
| 333 | * Check if there were limitations on the allocation (only relevant for |
| 334 | * NUMA) that may require different handling. |
| 335 | */ |
| 336 | switch (constrained_alloc(zonelist, gfp_mask)) { |
| 337 | case CONSTRAINT_MEMORY_POLICY: |
Dave Peterson | 0131592 | 2006-04-18 22:20:44 -0700 | [diff] [blame] | 338 | oom_kill_process(current, points, |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 339 | "No available memory (MPOL_BIND)"); |
| 340 | break; |
| 341 | |
| 342 | case CONSTRAINT_CPUSET: |
Dave Peterson | 0131592 | 2006-04-18 22:20:44 -0700 | [diff] [blame] | 343 | oom_kill_process(current, points, |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 344 | "No available memory in cpuset"); |
| 345 | break; |
| 346 | |
| 347 | case CONSTRAINT_NONE: |
KAMEZAWA Hiroyuki | fadd8fb | 2006-06-23 02:03:13 -0700 | [diff] [blame] | 348 | if (sysctl_panic_on_oom) |
| 349 | panic("out of memory. panic_on_oom is selected\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 350 | retry: |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 351 | /* |
| 352 | * Rambo mode: Shoot down a process and hope it solves whatever |
| 353 | * issues we may have. |
| 354 | */ |
| 355 | p = select_bad_process(&points); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 356 | |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 357 | if (PTR_ERR(p) == -1UL) |
| 358 | goto out; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 360 | /* Found nothing?!?! Either we hang forever, or we panic. */ |
| 361 | if (!p) { |
| 362 | read_unlock(&tasklist_lock); |
| 363 | cpuset_unlock(); |
| 364 | panic("Out of memory and no killable processes...\n"); |
| 365 | } |
| 366 | |
Dave Peterson | 0131592 | 2006-04-18 22:20:44 -0700 | [diff] [blame] | 367 | if (oom_kill_process(p, points, "Out of memory")) |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 368 | goto retry; |
| 369 | |
| 370 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 371 | } |
| 372 | |
Christoph Lameter | 9b0f8b0 | 2006-02-20 18:27:52 -0800 | [diff] [blame] | 373 | out: |
Andrew Morton | 140ffce | 2006-03-02 02:54:28 -0800 | [diff] [blame] | 374 | read_unlock(&tasklist_lock); |
Paul Jackson | 505970b | 2006-01-14 13:21:06 -0800 | [diff] [blame] | 375 | cpuset_unlock(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 376 | |
| 377 | /* |
| 378 | * Give "p" a good chance of killing itself before we |
Kirill Korotaev | 2f659f4 | 2006-01-08 01:01:05 -0800 | [diff] [blame] | 379 | * retry to allocate memory unless "p" is current |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 380 | */ |
Kirill Korotaev | 2f659f4 | 2006-01-08 01:01:05 -0800 | [diff] [blame] | 381 | if (!test_thread_flag(TIF_MEMDIE)) |
Andrew Morton | 140ffce | 2006-03-02 02:54:28 -0800 | [diff] [blame] | 382 | schedule_timeout_uninterruptible(1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 383 | } |