Re: [GIT PULL 0/2] perf session fix host_machine handling wrt build ids

[Stephane Eranian]

Hi,

On Wed, May 19, 2010 at 7:01 PM, Arnaldo Carvalho de Melo
<acme@xxxxxxxxxxxxx> wrote:
> Hi Ingo,
>
> Â Â Â ÂPlease pull from:
>
> git://git.kernel.org/pub/scm/linux/kernel/git/acme/linux-2.6 perf
>
> Stephane and Tom,
>
> Â Â Â ÂNow the build id code should be back working:
>
> [root@doppio linux-2.6-tip]# rm -rf /root/.debug/
> [root@doppio linux-2.6-tip]# perf record find / > /dev/null
> ^C[ perf record: Woken up 3 times to write data ]
> [ perf record: Captured and wrote 0.667 MB perf.data (~29163 samples) ]
> [root@doppio linux-2.6-tip]# perf buildid-list
> 349199a1e1b7cc25ac4f7004deed260f0146665e [kernel.kallsyms]


It is working again for me too. Thanks for the quick fix.

Related to .debug, I think it would be useful to have a choice as to
where all that stuff gets saved. It is hardcoded to $HOME today.

We could provide:
- an environment variable, e.g., PERFHOME or PERFDEBUGDIR
- an option to perf record, perf report, perf annotate, i.e., all commands
  that use .debug

I looked at that today and I have a draft patch to add both the variable
+ the option.

The problem with the environment variable is that you tend to forget to
set it. As you suggest below, you may run perf report on another machine
too and you don't necessarily want to overwrite the .debug you may already
have in your $HOME dir. I think the option has the advantage of making this
explicit. It would still default to $HOME if not set.


> 1f095dcd586045d7aa158b4774b8b053e7f580a4 /lib/modules/2.6.34-rc6/kernel/net/ipv4/netfilter/nf_nat.ko
> 78913cef49182f29a0237d9867ff12811df00663 /lib/modules/2.6.34-rc6/kernel/drivers/md/dm-crypt.ko
> 5b2b076ef0b0be593d76c96fbd4393455380e589 /lib/modules/2.6.34-rc6/kernel/drivers/ata/sata_sil.ko
> b6c457f3d69870e6f68f2c61978f8e3beb25221c /lib/modules/2.6.34-rc6/kernel/drivers/net/e1000e/e1000e.ko
> 2249bf363819205e320e242af2e757906be5010e /lib/modules/2.6.34-rc6/kernel/drivers/gpu/drm/i915/i915.ko
> a8e4f743b40fb1fd8b85e2f9b88d93b661472b8f /bin/find
> eb4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1 /lib64/libc-2.10.2.so
> 5c68f7afeb33309c78037e374b0deee84dd441f6 /lib64/libpthread-2.10.2.so
> [root@doppio linux-2.6-tip]# ls -la /root/.debug/
> total 28
> drwxr-xr-x  7 root root 4096 Mai 19 13:56 .
> drwxr-x---. 31 root root 4096 Mai 19 13:56 ..
> drwxr-xr-x  3 root root 4096 Mai 19 13:56 bin
> drwxr-xr-x Â76 root root 4096 Mai 19 13:56 .build-id
> drwxr-xr-x  2 root root 4096 Mai 19 13:56 [kernel.kallsyms]
> drwxr-xr-x  3 root root 4096 Mai 19 13:56 lib
> drwxr-xr-x  4 root root 4096 Mai 19 13:56 lib64
> [root@doppio linux-2.6-tip]# ls -la /root/.debug/.build-id/
> 03/ 0c/ 13/ 1e/ 20/ 28/ 2b/ 2d/ 34/ 3b/ 3f/ 47/ 56/ 5b/ 5e/ 6e/ 72/ 7e/
> 85/ 87/ 94/ 98/ a0/ a5/ a8/ ac/ bc/ c8/ cc/ d9/ dd/ e2/ e8/ eb/ ef/ f2/
> fd/ 0b/ 0e/ 19/ 1f/ 22/ 29/ 2c/ 2e/ 39/ 3e/ 42/ 55/ 57/ 5c/ 62/ 6f/ 78/
> 80/ 86/ 91/ 97/ 99/ a1/ a7/ a9/ b6/ c6/ ca/ d8/ dc/ df/ e3/ e9/ ed/ f1/
> fa/ fe/
> [root@doppio linux-2.6-tip]# ls -la /root/.debug/lib64/libc-2.10.2.so/eb4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1
> -rwxr-xr-x 2 root root 1825560 Nov 20 09:29 /root/.debug/lib64/libc-2.10.2.so/eb4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1
> [root@doppio linux-2.6-tip]# ls -la /root/.debug/.build-id/eb/4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1
> lrwxrwxrwx 1 root root 67 Mai 19 13:56 /root/.debug/.build-id/eb/4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1 -> ../../lib64/libc-2.10.2.so/eb4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1
> [root@doppio linux-2.6-tip]#
> [root@doppio linux-2.6-tip]# perf archive
> Now please run:
>
> $ tar xvf perf.data.tar.bz2 -C ~/.debug
>
> wherever you need to run 'perf report' on.
> [root@doppio linux-2.6-tip]#
>
> ot@doppio linux-2.6-tip]# tar tvf perf.data.tar.bz2
> lrwxrwxrwx root/root     0 2010-05-19 13:56 .build-id/34/9199a1e1b7cc25ac4f7004deed260f0146665e -> ../../[kernel.kallsyms]/349199a1e1b7cc25ac4f7004deed260f0146665e
> -rw-r--r-- root/root  2842888 2010-05-19 13:56 [kernel.kallsyms]/349199a1e1b7cc25ac4f7004deed260f0146665e
> lrwxrwxrwx root/root     0 2010-05-19 13:56 .build-id/1f/095dcd586045d7aa158b4774b8b053e7f580a4 -> ../../lib/modules/2.6.34-rc6/kernel/net/ipv4/netfilter/nf_nat.ko/1f095dcd586045d7aa158b4774b8b053e7f580a4
> -rw-r--r-- root/root  1670552 2010-04-30 11:43 lib/modules/2.6.34-rc6/kernel/net/ipv4/netfilter/nf_nat.ko/1f095dcd586045d7aa158b4774b8b053e7f580a4
> lrwxrwxrwx root/root     0 2010-05-19 13:56 .build-id/78/913cef49182f29a0237d9867ff12811df00663 -> ../../lib/modules/2.6.34-rc6/kernel/drivers/md/dm-crypt.ko/78913cef49182f29a0237d9867ff12811df00663
> -rw-r--r-- root/root  Â326827 2010-04-30 11:43 lib/modules/2.6.34-rc6/kernel/drivers/md/dm-crypt.ko/78913cef49182f29a0237d9867ff12811df00663
> lrwxrwxrwx root/root     0 2010-05-19 13:56 .build-id/5b/2b076ef0b0be593d76c96fbd4393455380e589 -> ../../lib/modules/2.6.34-rc6/kernel/drivers/ata/sata_sil.ko/5b2b076ef0b0be593d76c96fbd4393455380e589
> -rw-r--r-- root/root  Â325915 2010-04-30 11:43 lib/modules/2.6.34-rc6/kernel/drivers/ata/sata_sil.ko/5b2b076ef0b0be593d76c96fbd4393455380e589
> lrwxrwxrwx root/root     0 2010-05-19 13:56 .build-id/b6/c457f3d69870e6f68f2c61978f8e3beb25221c -> ../../lib/modules/2.6.34-rc6/kernel/drivers/net/e1000e/e1000e.ko/b6c457f3d69870e6f68f2c61978f8e3beb25221c
> -rw-r--r-- root/root  2587163 2010-04-30 11:43 lib/modules/2.6.34-rc6/kernel/drivers/net/e1000e/e1000e.ko/b6c457f3d69870e6f68f2c61978f8e3beb25221c
> lrwxrwxrwx root/root     0 2010-05-19 13:56 .build-id/22/49bf363819205e320e242af2e757906be5010e -> ../../lib/modules/2.6.34-rc6/kernel/drivers/gpu/drm/i915/i915.ko/2249bf363819205e320e242af2e757906be5010e
> -rw-r--r-- root/root  8296246 2010-04-30 11:43 lib/modules/2.6.34-rc6/kernel/drivers/gpu/drm/i915/i915.ko/2249bf363819205e320e242af2e757906be5010e
> lrwxrwxrwx root/root     0 2010-05-19 13:56 .build-id/a8/e4f743b40fb1fd8b85e2f9b88d93b661472b8f -> ../../bin/find/a8e4f743b40fb1fd8b85e2f9b88d93b661472b8f
> -rwxr-xr-x root/root  Â233032 2009-02-24 14:13 bin/find/a8e4f743b40fb1fd8b85e2f9b88d93b661472b8f
> lrwxrwxrwx root/root     0 2010-05-19 13:56 .build-id/eb/4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1 -> ../../lib64/libc-2.10.2.so/eb4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1
> -rwxr-xr-x root/root  1825560 2009-11-20 09:29 lib64/libc-2.10.2.so/eb4ec8fa8b2a5eb18cad173c92f27ed8887ed1c1
> lrwxrwxrwx root/root     0 2010-05-19 13:56 .build-id/5c/68f7afeb33309c78037e374b0deee84dd441f6 -> ../../lib64/libpthread-2.10.2.so/5c68f7afeb33309c78037e374b0deee84dd441f6
> -rwxr-xr-x root/root  Â148528 2009-11-20 09:29 lib64/libpthread-2.10.2.so/5c68f7afeb33309c78037e374b0deee84dd441f6
> [root@doppio linux-2.6-tip]#
>
> Regards,
>
> - Arnaldo
>
> Arnaldo Carvalho de Melo (2):
> Âperf symbols: Don't try to read the build-id twice
> Âperf session: Make read_build_id routines look at the host_machine too
>
> Âtools/perf/util/header.c Â| Â 84 ++++++++++++++++++++++++++++-----------------
> Âtools/perf/util/session.c | Â Â7 ++++
> Âtools/perf/util/session.h | Â Â8 +---
> Âtools/perf/util/symbol.c Â| Â 13 ++++++-
> Âtools/perf/util/symbol.h Â| Â Â1 +
> Â5 files changed, 73 insertions(+), 40 deletions(-)
>
>
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