Re: [PATCH] make vm_enough_memory more efficient

From: Andrew Morton (
Date: Thu Jan 16 2003 - 03:14:47 EST

"Martin J. Bligh" <> wrote:
> vm_enough_memory seems to call si_meminfo just to get the total
> RAM, which seems far too expensive. This replaces the comment
> saying "this is crap" with some code that's less crap.
> Not heavily tested (compiles and boots), but seems pretty obvious.

Yup, obviously correct.

The really hurtful part of vm_enough_memory() is the call to
get_page_cache_size(), which has to go over every CPU's local VM statistics
in get_page_state().

But I guess you're running with sysctl_overcommit_memory != 0.

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This archive was generated by hypermail 2b29 : Thu Jan 23 2003 - 22:00:12 EST