Re: [PATCH] fs: pipe/sockets/anon dentries should not have a parent

[Eric Dumazet]

Ingo Molnar a écrit :
> * Eric Dumazet <dada1@xxxxxxxxxxxxx> wrote:
>
> > Before patch, time to run 8 millions of close(socket()) calls on 8 
> > CPUS was :
> >
> > real    0m27.496s
> > user    0m0.657s
> > sys     3m39.092s
> >
> > After patch :
> >
> > real    0m23.997s
> > user    0m0.682s
> > sys     3m11.193s
>
> cool :-)
>
> What would it take to get it down to:
>
> > > Cost if run one one cpu :
> > >
> > > real    0m1.561s
> > > user    0m0.092s
> > > sys     0m1.469s
>
> i guess asking for a wall-clock cost of 1.561/8 would be too much? :)

It might be possible, depending on the level of hackery I am allowed to inject
in fs/dcache.c and fs/inode.c :)

wall cost of 1.56 (each cpu runs one loop of one million iterations)


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