Commit 578c2fd6 authored by Janet Morgan's avatar Janet Morgan Committed by Linus Torvalds
Browse files

[PATCH] add OOM debug



This patch provides more debug info when the system is OOM.  It displays
memory stats (basically sysrq-m info) from __alloc_pages() when page
allocation fails and during OOM kill.

Thanks to Dave Jones for coming up with the idea.
Signed-off-by: default avatarJanet Morgan <janetmor@us.ibm.com>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent c2f29ea1
......@@ -258,6 +258,10 @@ void out_of_memory(unsigned int __nocast gfp_mask)
struct mm_struct *mm = NULL;
task_t * p;
printk("oom-killer: gfp_mask=0x%x\n", gfp_mask);
/* print memory stats */
show_mem();
read_lock(&tasklist_lock);
retry:
p = select_bad_process();
......@@ -268,12 +272,9 @@ retry:
/* Found nothing?!?! Either we hang forever, or we panic. */
if (!p) {
read_unlock(&tasklist_lock);
show_free_areas();
panic("Out of memory and no killable processes...\n");
}
printk("oom-killer: gfp_mask=0x%x\n", gfp_mask);
show_free_areas();
mm = oom_kill_process(p);
if (!mm)
goto retry;
......
......@@ -935,6 +935,7 @@ nopage:
" order:%d, mode:0x%x\n",
p->comm, order, gfp_mask);
dump_stack();
show_mem();
}
return NULL;
got_pg:
......
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