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Subject[PATCH] fork() failing

Linus,

As you know, we currently allow 1-order allocations to fail easily.

However, there is one special case of 1-order allocations which cannot
fail: fork.

Here is the tested patch against pre4.

--- linux.orig/mm/page_alloc.c Thu Oct 18 14:26:28 2001
+++ linux/mm/page_alloc.c Thu Oct 18 16:23:15 2001
@@ -393,8 +393,13 @@
}
}

- /* Don't let big-order allocations loop */
- if (order)
+ /* We have one special 1-order alloc user: fork().
+ * It obviously cannot fail easily like other
+ * high order allocations. This could also be fixed
+ * by having a __GFP_LOOP flag to indicate that the
+ * high order allocation is "critical".
+ */
+ if (order > 1)
return NULL;

/* Yield for kswapd, and try again */
-
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