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

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Message-ID: <1441266585059.29731@transmode.com>
Date:	Thu, 3 Sep 2015 07:49:45 +0000
From:	Kenth Eriksson <kenth.eriksson@...nsmode.com>
To:	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: perf fails to mmap data file (JFFS2)

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?

Thanks,
Kenth 

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