From 0f2c3de2ba110626515234d5d584fb1b0c0749a2 Mon Sep 17 00:00:00 2001
From: Andy Isaacson <adi@hexapodia.org>
Date: Fri, 11 Jun 2010 20:36:15 -0700
Subject: [PATCH] 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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