From: Andy Isaacson <adi@hexapodia.org>
Date: Sat, 12 Jun 2010 03:36:15 +0000 (-0700)
Subject: perf session: fix error message on failure to open perf.data
X-Git-Tag: v2.6.36-rc1~532^2~64
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0f2c3de2ba110626515234d5d584fb1b0c0749a2;p=pandora-kernel.git

perf session: fix error message on failure to open perf.data

If we cannot open our data file, print strerror(errno) for a more
comprehensible error message; and only suggest 'perf record' on ENOENT.

In particular, this fixes the nonsensical advice when:

    % sudo perf record sleep 1
    [ perf record: Woken up 1 times to write data ]
    [ perf record: Captured and wrote 0.009 MB perf.data (~381 samples) ]
    % perf trace
    failed to open file: perf.data  (try 'perf record' first)
    %

Cc: Ingo Molnar <mingo@elte.hu>
LPU-Reference: <20100612033615.GA24731@hexapodia.org>
Signed-off-by: Andy Isaacson <adi@hexapodia.org>
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
---

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