linux-kernel - Re: [PATCH v1 06/15] perf session: load data directory into tool process memory

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Date:   Wed, 21 Oct 2020 15:54:29 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Alexey Budankov <alexey.budankov@...ux.intel.com>
Cc:     Andi Kleen <ak@...ux.intel.com>,
        Arnaldo Carvalho de Melo <acme@...nel.org>,
        Jiri Olsa <jolsa@...hat.com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Peter Zijlstra <peterz@...radead.org>,
        Ingo Molnar <mingo@...hat.com>,
        linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 06/15] perf session: load data directory into tool
 process memory

Hi,

On Tue, Oct 13, 2020 at 8:30 PM Alexey Budankov
<alexey.budankov@...ux.intel.com> wrote:
> On 12.10.2020 19:49, Alexey Budankov wrote:
> > On 12.10.2020 19:09, Andi Kleen wrote:
> >> On Mon, Oct 12, 2020 at 11:58:58AM +0300, Alexey Budankov wrote:
> >>> diff --git a/tools/perf/util/session.c b/tools/perf/util/session.c
> >>> index 6afc670fdf0c..0752eec19813 100644
> >>> --- a/tools/perf/util/session.c
> >>> +++ b/tools/perf/util/session.c
> >>> @@ -2212,6 +2212,17 @@ reader__process_events(struct reader *rd, struct perf_session *session,
> >>>             goto more;
> >>>
> >>>  out:
> >>> +   if (rd->unmap_file) {
> >>> +           int i;
> >>> +
> >>> +           for (i = 0; i < NUM_MMAPS; i++) {
> >>> +                   if (mmaps[i]) {
> >>> +                           munmap(mmaps[i], mmap_size);
> >>> +                           mmaps[i] = NULL;
> >>
> >> Okay so where is the mmap? Would make more sense to put that
> >> into the same patch as who adds the mmap. Or is the mmap
> >> code already in the perf source? In that case it should
> >> probably be some common helper with the existing users.
> >
> > That mmap is already in the code. Agree, this part of the patch
> > can be applied prior the whole patch set.
>
> I take it back. Single trace file can't be unmapped yet since it also
> contains not only compressed records but also other records backing
> the data for aggregated analysis.

Are you talking about the auxtrace?

I thought everything will be compressed when it's enabled.
But if it's only for the auxtrace, maybe we can unmap them
with checking it as it's not the common case?

Thanks
Namhyung