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From: Namhyung Kim <namhyung@gmail.com>
To: Milian Wolff <mail@milianw.de>
Cc: Jiri Olsa <jolsa@redhat.com>,
	linux-perf-users <linux-perf-users@vger.kernel.org>,
	Arnaldo Carvalho de Melo <acme@kenel.org>
Subject: Re: missing mmap events in perf profiles without dwarf callgraph
Date: Tue, 19 Jan 2021 18:36:11 +0900	[thread overview]
Message-ID: <CAM9d7cihUNLX9wAWkNi5-J1HC4NPhD_mFW9EFc77t=SAFF10-A@mail.gmail.com> (raw)
In-Reply-To: <7161646.QLfhZlOSzD@milian-workstation>

Hi Milian,

On Tue, Jan 19, 2021 at 5:11 PM Milian Wolff <mail@milianw.de> wrote:
>
> On Donnerstag, 14. Januar 2021 09:56:36 CET Namhyung Kim wrote:
> > What I noticed is ss->adjust_symbols which is set for user DSOs.  It does
> >
> >   sym.st_value -= shdr.sh_addr - shdr.sh_offset
> >
> > Maybe your program's section header has different values?
>
> Hey Namhyung,
>
> how would I figure that one out? Isn't that data shown in the readelf output
> above? Put differently: Could someone else maybe show his readelf output so we
> can compare?

I mean the below.  In my case, address and offset of the .text section are
same as 0x1080.

Thanks,
Namhyung


$ readelf -S a.out
There are 37 section headers, starting at offset 0x1df20:

Section Headers:
  [Nr] Name              Type             Address           Offset
       Size              EntSize          Flags  Link  Info  Align
  [ 0]                   NULL             0000000000000000  00000000
       0000000000000000  0000000000000000           0     0     0
  [ 1] .interp           PROGBITS         00000000000002a8  000002a8
       000000000000001c  0000000000000000   A       0     0     1
  [ 2] .note.gnu.bu[...] NOTE             00000000000002c4  000002c4
       0000000000000024  0000000000000000   A       0     0     4
  [ 3] .note.ABI-tag     NOTE             00000000000002e8  000002e8
       0000000000000020  0000000000000000   A       0     0     4
  [ 4] .gnu.hash         GNU_HASH         0000000000000308  00000308
       0000000000000028  0000000000000000   A       5     0     8
  [ 5] .dynsym           DYNSYM           0000000000000330  00000330
       0000000000000138  0000000000000018   A       6     1     8
  [ 6] .dynstr           STRTAB           0000000000000468  00000468
       00000000000000fb  0000000000000000   A       0     0     1
  [ 7] .gnu.version      VERSYM           0000000000000564  00000564
       000000000000001a  0000000000000002   A       5     0     2
  [ 8] .gnu.version_r    VERNEED          0000000000000580  00000580
       0000000000000040  0000000000000000   A       6     2     8
  [ 9] .rela.dyn         RELA             00000000000005c0  000005c0
       0000000000000108  0000000000000018   A       5     0     8
  [10] .rela.plt         RELA             00000000000006c8  000006c8
       0000000000000060  0000000000000018  AI       5    23     8
  [11] .init             PROGBITS         0000000000001000  00001000
       0000000000000017  0000000000000000  AX       0     0     4
  [12] .plt              PROGBITS         0000000000001020  00001020
       0000000000000050  0000000000000010  AX       0     0     16
  [13] .plt.got          PROGBITS         0000000000001070  00001070
       0000000000000008  0000000000000008  AX       0     0     8
  [14] .text             PROGBITS         0000000000001080  00001080
       000000000000201e  0000000000000000  AX       0     0     16
  ...

  reply	other threads:[~2021-01-19 18:27 UTC|newest]

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-01-11 16:56 missing mmap events in perf profiles without dwarf callgraph Milian Wolff
2021-01-13 10:30 ` Jiri Olsa
2021-01-13 17:47   ` Milian Wolff
2021-01-13 18:45     ` Jiri Olsa
2021-01-13 19:18       ` Milian Wolff
2021-01-14  8:56         ` Namhyung Kim
2021-01-19  8:09           ` Milian Wolff
2021-01-19  9:36             ` Namhyung Kim [this message]
2021-01-19 11:33               ` Milian Wolff

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