linux-kernel - Re: [PATCH 4/7] perf inject: Do not load map/dso when injecting build-id

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Message-ID: <20200924144632.GA357981@google.com>
Date:   Thu, 24 Sep 2020 23:46:32 +0900
From:   Namhyung Kim <namhyung@...nel.org>
To:     Jiri Olsa <jolsa@...hat.com>
Cc:     Arnaldo Carvalho de Melo <acme@...nel.org>,
        Ingo Molnar <mingo@...nel.org>,
        Peter Zijlstra <a.p.zijlstra@...llo.nl>,
        Mark Rutland <mark.rutland@....com>,
        Alexander Shishkin <alexander.shishkin@...ux.intel.com>,
        LKML <linux-kernel@...r.kernel.org>,
        Stephane Eranian <eranian@...gle.com>,
        Ian Rogers <irogers@...gle.com>
Subject: Re: [PATCH 4/7] perf inject: Do not load map/dso when injecting
 build-id

On Thu, Sep 24, 2020 at 03:44:44PM +0200, Jiri Olsa wrote:
> On Thu, Sep 24, 2020 at 10:20:51PM +0900, Namhyung Kim wrote:
> > On Thu, Sep 24, 2020 at 10:09 PM Jiri Olsa <jolsa@...hat.com> wrote:
> > >
> > > On Wed, Sep 23, 2020 at 05:05:34PM +0900, Namhyung Kim wrote:
> > >
> > > SNIP
> > >
> > > > -static inline int is_no_dso_memory(const char *filename)
> > > > -{
> > > > -     return !strncmp(filename, "[stack", 6) ||
> > > > -            !strncmp(filename, "/SYSV",5)   ||
> > > > -            !strcmp(filename, "[heap]");
> > > > -}
> > > > -
> > > >  static inline int is_android_lib(const char *filename)
> > > >  {
> > > >       return strstarts(filename, "/data/app-lib/") ||
> > > > @@ -158,7 +143,7 @@ struct map *map__new(struct machine *machine, u64 start, u64 len,
> > > >               int anon, no_dso, vdso, android;
> > > >
> > > >               android = is_android_lib(filename);
> > > > -             anon = is_anon_memory(filename, flags);
> > > > +             anon = is_anon_memory(filename) || flags & MAP_HUGETLB;
> > >
> > > what's the reason to take 'flags & MAP_HUGETLB' out of is_anon_memory?
> > 
> > The MAP_HUGETLB is defined in uapi/linux/mman.h and I had trouble
> > when including the header in the map.h file.
> 
> could you share the error? it might be corner case, but it
> could bite us in future

Sure.

  CC       util/session.o
In file included from /home/namhyung/project/linux/tools/include/uapi/asm-generic/mman-common-tools.h:5,
                 from /home/namhyung/project/linux/tools/include/uapi/asm-generic/mman.h:5,
                 from /home/namhyung/project/linux/tools/arch/x86/include/uapi/asm/mman.h:5,
                 from /home/namhyung/project/linux/tools/include/uapi/linux/mman.h:5,
                 from util/map.h:13,
                 from util/session.c:21:
/home/namhyung/project/linux/tools/include/uapi/asm-generic/mman-common.h:26: error: "MAP_POPULATE" redefined [-Werror]
   26 | #define MAP_POPULATE  0x008000 /* populate (prefault) pagetables */
      | 
In file included from /usr/include/x86_64-linux-gnu/bits/mman.h:31,
                 from /usr/include/x86_64-linux-gnu/sys/mman.h:41,
                 from util/session.c:12:
/usr/include/x86_64-linux-gnu/bits/mman-map-flags-generic.h:34: note: this is the location of the previous definition
   34 | # define MAP_POPULATE 0x08000  /* Populate (prefault) pagetables.  */
      | 

This is repeated for each macro definitions..


> 
> also flags are stored just in map not dso so you'd need to
> add that as arg to dso__inject_build_id

Will do.

Thanks
Namhyung