Messages in this thread | | | Date | Fri, 3 Jul 2015 12:16:36 -0300 | From | Arnaldo Carvalho de Melo <> | Subject | Re: [RFC] perf tools: Add hugetlbfs memory recognition |
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Em Fri, Jul 03, 2015 at 06:21:48PM +0800, Hou Pengyang escreveu: > On 2015/6/30 22:50, Arnaldo Carvalho de Melo wrote: > >Well, we _can_ detect this automatically, its just a matter of parsing > >/proc/PID/smaps, right?
<SNIP>
> >What I was discussing was a way only parse smaps when we know we need > >to, i.e. when we, for instance, parsing /proc/PID/maps, find a map that > >we think may be a hugetlb one, maybe some other way to tell us that > >hugetlb maps are in place, looking at the hugetlbfs stats somehow?
<SNIP>
> from /proc/self/mounts, we can get mount point of hugetlbfs. > in my system, it is "/mnt/huge". So that, when mmap2 event > comes from userspace, we can compare prefix of filename with > hugetlbfs mount point (e.g "/mnt/huge") to check if it is a > file in hugetlbfs. if it is, set MAP_HUGELTB, otherwise, not set.
> There is no need to parse /proc/PID/smaps now, what's more, > it is not difficult to parse "/proc/self/mounts".
A-ha! please take a look at using the find_mountpoint() function in tools/lib/api/fs/, I guess that should be enough for you?
- Arnaldo
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