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SubjectRe: Avoiding OOM on overcommit...?
On Fri, 24 Mar 2000, Alexander Viro wrote:
>On Fri, 24 Mar 2000, David Whysong wrote:
>
>> No, it has overcommitted memory almost since the beginning. These comments
>> are from linux 1.0.0, in mm/memory.c. Note the dates:
>>
>> /*
>> * demand-loading started 01.12.91 - seems it is high on the list of
>> * things wanted, and it should be easy to implement. - Linus
>> */
>>
>> /*
>> * Ok, demand-loading was easy, shared pages a little bit tricker. Shared
>> * pages started 02.12.91, seems to work. - Linus.
>> *
>> * Tested sharing by executing about 30 /bin/sh: under the old kernel it
>> * would have taken more than the 6M I have free, but it worked well as
>> * far as I could see.
>> *
>> * Also corrected some "invalidate()"s - I wasn't doing enough of them.
>> */
>
>RTFComments. Sharing of text pages is unrelated to overcommit.

But demand loading certainly is related to overcommit, unless the kernel
was careful to count how many pages it hasn't loaded yet?

Dave

David Whysong dwhysong@physics.ucsb.edu
Astrophysics graduate student University of California, Santa Barbara
My public PGP keys are on my web page - http://www.physics.ucsb.edu/~dwhysong
DSS PGP Key 0x903F5BD6 : FE78 91FE 4508 106F 7C88 1706 B792 6995 903F 5BD6
D-H PGP key 0x5DAB0F91 : BC33 0F36 FCCD E72C 441F 663A 72ED 7FB7 5DAB 0F91


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