[Linaro-mm-sig] Memory Management Discussion
jbarnes at virtuousgeek.org
Thu Apr 21 15:15:57 UTC 2011
On Thu, 21 Apr 2011 17:04:58 +0200
Arnd Bergmann <arnd at arndb.de> wrote:
> On Thursday 21 April 2011, Jesse Barnes wrote:
> > Client apps also have to worry about the fd count, since depending on
> > the app and object caching policy it's very easy to get over 1024
> > objects. But the solutions above may work for that case as well; I
> > don't expect many apps rely on select(), and those that do can fairly
> > easily be converted.
> Hmm, I think client apps are a much harder problem, because they are
> not under a central control. Note that there may be libraries using
> select(), so you would not be able to link to those, and you'd also
> need to solve the ulimit problem here.
For exising apps especially that's an issue. Lots of apps use external
libs via NDK.
But there's another option for those: put the unified mm fds in "high"
fd space. I think there are patches floating around to do that on
glibc and Linux, which makes things easier in general for libraries that
want to allocate their own fds, and other C libraries could implement
something similar, assuming we had kernel support.
Jesse Barnes, Intel Open Source Technology Center
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