Messages in this thread | | | Date | Tue, 16 Mar 2004 13:59:51 -0300 (BRT) | From | Marcelo Tosatti <> | Subject | Re: [2.4] heavy-load under swap space shortage |
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On Tue, 16 Mar 2004, Andrea Arcangeli wrote:
> On Tue, Mar 16, 2004 at 03:31:33AM -0300, Marcelo Tosatti wrote: > > > > > > On Sun, 14 Mar 2004, Andrew Morton wrote: > > > > > Andrea Arcangeli <andrea@suse.de> wrote: > > > > > > > > > > > > > > Having a magic knob is a weak solution: the majority of people who are > > > > > affected by this problem won't know to turn it on. > > > > > > > > that's why I turned it _on_ by default in my tree ;) > > > > > > So maybe Marcelo should apply this patch, and also turn it on by default. > > > > Hhhmm, not so easy I guess. What about the added overhead of > > lru_cache_add() for every anonymous page created? > > > > I bet this will cause problems for users which are happy with the current > > behaviour. Wont it? > > the lru_cache_add is happening in 2.4 mainline, the only point of the > patch is to _avoid_ calling lru_cache_add (tunable with a sysctl so you > can get to the old behaviour of calling lru_cache_add for every anon > page).
Uh oh, just ignore me.
I misread the message, and misunderstood the whole thing. Will go reread the patch, and the code.
> > Andrea, do you have any numbers (or at least estimates) for the added > > overhead of instantly addition of anon pages to the LRU? That would be > > cool to know.2A2A2A > > I've the numbers for the removed overhead, that's significant in some > workload, but only in the >=16-ways.
And for those workloads one should turn be able to turn it off - right.
> > Obviously we dont have, and dont want to, such things in 2.4. > > agreed ;) > > > Anyway, it seems this discussion is being productive. Glad! > > yep! >
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