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authorChristoph Lameter <clameter@engr.sgi.com>2006-02-20 21:27:52 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-20 23:00:09 -0500
commit9b0f8b040acd8dfd23860754c0d09ff4f44e2cbc (patch)
tree33c69908705c88b86f14d9e835b6dee6a9c3a31b /include/linux/swap.h
parent9827b781f20828e5ceb911b879f268f78fe90815 (diff)
[PATCH] Terminate process that fails on a constrained allocation
Some allocations are restricted to a limited set of nodes (due to memory policies or cpuset constraints). If the page allocator is not able to find enough memory then that does not mean that overall system memory is low. In particular going postal and more or less randomly shooting at processes is not likely going to help the situation but may just lead to suicide (the whole system coming down). It is better to signal to the process that no memory exists given the constraints that the process (or the configuration of the process) has placed on the allocation behavior. The process may be killed but then the sysadmin or developer can investigate the situation. The solution is similar to what we do when running out of hugepages. This patch adds a check before we kill processes. At that point performance considerations do not matter much so we just scan the zonelist and reconstruct a list of nodes. If the list of nodes does not contain all online nodes then this is a constrained allocation and we should kill the current process. Signed-off-by: Christoph Lameter <clameter@sgi.com> Cc: Nick Piggin <nickpiggin@yahoo.com.au> Cc: Andi Kleen <ak@muc.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'include/linux/swap.h')
-rw-r--r--include/linux/swap.h2
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index f3e17d5963c3..d572b19afb7d 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -147,7 +147,7 @@ struct swap_list_t {
147#define vm_swap_full() (nr_swap_pages*2 < total_swap_pages) 147#define vm_swap_full() (nr_swap_pages*2 < total_swap_pages)
148 148
149/* linux/mm/oom_kill.c */ 149/* linux/mm/oom_kill.c */
150extern void out_of_memory(gfp_t gfp_mask, int order); 150extern void out_of_memory(struct zonelist *zonelist, gfp_t gfp_mask, int order);
151 151
152/* linux/mm/memory.c */ 152/* linux/mm/memory.c */
153extern void swapin_readahead(swp_entry_t, unsigned long, struct vm_area_struct *); 153extern void swapin_readahead(swp_entry_t, unsigned long, struct vm_area_struct *);