From: Andi Kleen <andi@firstfloor.org>
To: Kenth Eriksson <kenth.eriksson@transmode.com>
Cc: "linux-kernel\@vger.kernel.org" <linux-kernel@vger.kernel.org>
Subject: Re: perf fails to mmap data file (JFFS2)
Date: Thu, 03 Sep 2015 11:57:32 -0700 [thread overview]
Message-ID: <87d1xz49gj.fsf@tassilo.jf.intel.com> (raw)
In-Reply-To: <1441266585059.29731@transmode.com> (Kenth Eriksson's message of "Thu, 3 Sep 2015 07:49:45 +0000")
Kenth Eriksson <kenth.eriksson@transmode.com> writes:
> perf on 4.1 fails to mmap the perf data file (in
> __perf_session__process_events) with error code 22 (invalid
> argument). I believe the JFFS2 file system does not support PROT_READ
> and MAP_SHARED. How can this be fixed? Can we change from MAP_SHARED
> to MAP_PRIVATE, or is there a reason to make it shared?
MAP_PRIVATE should be fine.
-Andi
next prev parent reply other threads:[~2015-09-03 18:57 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-09-03 7:49 perf fails to mmap data file (JFFS2) Kenth Eriksson
2015-09-03 18:57 ` Andi Kleen [this message]
2015-09-04 7:00 ` [PATCH] Fix mmap error for perf data file. Not all file systems, e.g. JFFS2, support MAP_SHARED Kenth Eriksson
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