linux-kernel - Using a new perf tool against an older kernel

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Date:	Wed, 22 Jun 2011 14:39:47 -0700
From:	Arun Sharma <asharma@...com>
To:	linux-perf-users@...r.kernel.org
CC:	linux-kernel@...r.kernel.org
Subject: Using a new perf tool against an older kernel

I ran into a few strange issues today using a new perf tool (3.0-rcX) 
against a 2.6.38 based kernel. Basic things seem to work:

# perf record -aR -- sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 0.443 MB perf.data (~19334 samples) ]

But:

# perf record -agR -- sleep 1
[ perf record: Woken up 1 times to write data ]
[ perf record: Captured and wrote 1.558 MB perf.data (~68077 samples) ]
Can't find id 9's machine
Found 1 unknown events!

Is this an older tool processing a perf.data file generated by a more 
recent tool?

If that is not the case, consider reporting to linux-kernel@...r.kernel.org.

I couldn't tell if this is kernel/user space incompatibility or tighter 
error checking in the new perf tool. Before I start digging further, 
thought I'd ask if this combination is supported. The error message 
above doesn't ask me:

Are you using an old kernel?

  -Arun

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/