Messages in this thread | | | Subject | Re: VM tuning through fault trace gathering [with actual code] | From | John Fremlin <> | Date | 25 Jun 2001 22:15:31 +0100 |
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Rik van Riel <riel@conectiva.com.br> writes:
> On 25 Jun 2001, John Fremlin wrote: > > > Last year I had the idea of tracing the memory accesses of the > > system to improve the VM - the traces could be used to test > > algorithms in userspace. The difficulty is of course making all > > memory accesses fault without destroying system performance. > > Sounds like a cool idea. One thing you should keep in mind though > is to gather traces of the WHOLE SYSTEM and not of individual > applications.
In the current patch all pagefaults are recorded from all sources. I'd like to be able to catch read(2) and write(2) (buffer cache stuff) as well but I don't know how . . . .
> There has to be a way to balance the eviction of pages from > applications against those of other applications.
Of course! It is important not to regard each thread group as an independent entity IMHO (had a big old argument about this).
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