Re: [PATCH 2/3] perf tools: Cache dso data file descriptor

[David Ahern]

On 4/28/14, 7:16 AM, Namhyung Kim wrote:
> 2014-04-28 (ì), 12:01 +0200, Jiri Olsa:
> > On Sun, Apr 27, 2014 at 11:36:35PM +0900, Namhyung Kim wrote:
> > > 2014-04-17 (ë), 19:39 +0200, Jiri Olsa:
> > > > Keeping the data file description open for the whole life
> > > > of the dso object.
> > >
> > > I suspect there might be an issue for reporting very large data file
> > > with this approach - like open file limit?
> >
> > I've got as high as ~200 openned file descriptors for
> > ~2GB data of system wide monitoring
> >
> > but right that could be an issue.. I wonder we could
> > workaround this somehow, because the speed up is quite
> > noticable
> >
> > how about we monitor number of openned dso file descriptor
> > and once we cross this we close some portion of them
> >
> > or something along those lines ;-)
>
> Yeah, we'll need some way to control those eventually.

Handle EMFILE failures. Find an "old" one and close it to let the new 
one succeed.

David

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