On Fri, 21 Dec 2007, Dhaval Giani wrote:
> No, it does not stop the oom I am seeing here.
Duh. Disregard that patch. It looks like check_pgt_cache() is not called.
This could happen if tlb_flush_mmu is never called during the
fork/terminate sequences in your script. pgd_free is called *after* a
possible tlb flush so the pgd page is on the quicklist (which is good for
the next process which needs a pgd). The tlb_flush_mmu's during pte
eviction should trim the quicklist. For some reason this is not happening
on your box (it works here).
Could you try this script that insures that check_pgt_cache is called
after every pgd_free?
Index: linux-2.6/arch/x86/mm/pgtable_32.c
===================================================================
--- linux-2.6.orig/arch/x86/mm/pgtable_32.c 2007-12-26 12:55:10.000000000 -0800
+++ linux-2.6/arch/x86/mm/pgtable_32.c 2007-12-26 12:55:54.000000000 -0800
@@ -366,6 +366,15 @@ void pgd_free(pgd_t *pgd)
}
/* in the non-PAE case, free_pgtables() clears user pgd entries */
quicklist_free(0, pgd_dtor, pgd);
+
+ /*
+ * We must call check_pgd_cache() here because the pgd is freed after
+ * tlb flushing and the call to check_pgd_cache. In some cases the VM
+ * may not call tlb_flush_mmu during process termination (??).
+ * If this is repeated then we may never call check_pgd_cache.
+ * The quicklist will grow and grow. So call check_pgd_cache here.
+ */
+ check_pgt_cache();
}
void check_pgt_cache(void)
--
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