Re: [crash] Re: Latest brk patchset

From: H. Peter Anvin
Date: Mon Mar 16 2009 - 16:31:16 EST


Jeremy Fitzhardinge wrote:
Yinghai Lu wrote:
-INIT_MAP_SIZE = (PAGE_TABLE_SIZE + ALLOCATOR_SLOP) * PAGE_SIZE_asm
-RESERVE_BRK(pagetables, INIT_MAP_SIZE)
+/* Enough space to fit pagetables for the low memory linear map */
+MAPPING_BEYOND_END = (PAGE_TABLE_SIZE(1 << (32 - PAGE_SHIFT)) * PAGE_SIZE)

that is for 4g?

Yes, I suppose it only needs to be 1G. But it doesn't make much difference in practice.


A tighter bound would probably be nice, if nothing else because tighter bounds tend to catch more bugs.

-hpa

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