Re: [PATCHv2 0/2] perf tools: Share struct map after clone

[Jiri Olsa]

On Tue, Oct 29, 2019 at 09:58:55PM +0100, Jiri Olsa wrote:
> On Wed, Oct 23, 2019 at 09:55:17AM +0200, Jiri Olsa wrote:
> > On Wed, Oct 16, 2019 at 10:22:24AM +0200, Jiri Olsa wrote:
> > > hi,
> > > Andi reported that maps cloning is eating lot of memory and
> > > it's probably unnecessary, because they keep the same data.
> > > 
> > > This 'maps sharing' seems to save lot of heap for reports with
> > > many forks/cloned mmaps (over 60% in example below).
> > > 
> > > Profile kernel build:
> > > 
> > >   $ perf record make -j 40
> > > 
> > > Get heap profile (tools/perf directory):
> > > 
> > >   $ <install gperftools>
> > >   $ make TCMALLOC=1
> > >   $ HEAPPROFILE=/tmp/heapprof ./perf report -i perf.data --stdio > out
> > >   $ pprof ./perf /tmp/heapprof.000*
> > > 
> > > Before:
> > > 
> > >   (pprof) top
> > >   Total: 2335.5 MB
> > >     1735.1  74.3%  74.3%   1735.1  74.3% memdup
> > >      402.0  17.2%  91.5%    402.0  17.2% zalloc
> > >      140.2   6.0%  97.5%    145.8   6.2% map__new
> > >       33.6   1.4%  98.9%     33.6   1.4% symbol__new
> > >       12.4   0.5%  99.5%     12.4   0.5% alloc_event
> > >        6.2   0.3%  99.7%      6.2   0.3% nsinfo__new
> > >        5.5   0.2% 100.0%      5.5   0.2% nsinfo__copy
> > >        0.3   0.0% 100.0%      0.3   0.0% dso__new
> > >        0.1   0.0% 100.0%      0.1   0.0% do_read_string
> > >        0.0   0.0% 100.0%      0.0   0.0% __GI__IO_file_doallocate
> > > 
> > > After:
> > > 
> > >   (pprof) top
> > >   Total: 784.5 MB
> > >      385.8  49.2%  49.2%    385.8  49.2% memdup
> > >      285.8  36.4%  85.6%    285.8  36.4% zalloc
> > >       80.4  10.3%  95.9%     83.7  10.7% map__new
> > >       19.1   2.4%  98.3%     19.1   2.4% symbol__new
> > >        6.2   0.8%  99.1%      6.2   0.8% alloc_event
> > >        3.6   0.5%  99.6%      3.6   0.5% nsinfo__new
> > >        3.2   0.4% 100.0%      3.2   0.4% nsinfo__copy
> > >        0.2   0.0% 100.0%      0.2   0.0% dso__new
> > >        0.0   0.0% 100.0%      0.0   0.0% do_read_string
> > >        0.0   0.0% 100.0%      0.0   0.0% elf_fill
> > > 
> > > v2 changes:
> > >   - rebased to Arnaldo's perf/core
> > >   - patch 1 already taken
> > > 
> > > Also available in here:
> > >   git://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
> > >   perf/map_shared
> > 
> > I rebased to latest perf/core and pushed the branch out
> 
> rebased and pushed out

heya,
I lost track of this.. what's the status, are you going with your
version, or is this one still in? I don't see any of them in latest
code..

thanks,
jirka