Review request for 5049299 (original) (raw)
Martin Buchholz martinrb at google.com
Sat Jun 27 17:41:54 UTC 2009
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On Tue, Jun 23, 2009 at 07:33, Andrew Haley <aph at redhat.com> wrote:
Isn't there some point at which you have to say to a Linux user "Your system is simply misconfigured. Fix the overcommit parameter and this problem will go away" ?
99% of users will use the default value of the overcommit parameter and we have to try to make that work well.
I have thought about what we could do to fix Linux generally. Perhaps we could have a variant of fork() that promised the kernel that we are about to exec. Then the COW'ed pages after fork wouldn't count towards overcommit. If memory was very tight, one could suspend all the threads in the parent process until the child exec'ed, to minimize the number of pages that were written to in the parent.
Martin
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