linux-kernel - Re: perf fails to mmap data file (JFFS2)

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Message-ID: <87d1xz49gj.fsf@tassilo.jf.intel.com>
Date:	Thu, 03 Sep 2015 11:57:32 -0700
From:	Andi Kleen <andi@...stfloor.org>
To:	Kenth Eriksson <kenth.eriksson@...nsmode.com>
Cc:	"linux-kernel\@vger.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: perf fails to mmap data file (JFFS2)

Kenth Eriksson <kenth.eriksson@...nsmode.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
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