perf fails to mmap data file (JFFS2)

From	Kenth Eriksson <kenth.eriksson@transmode.com>
Newsgroups	linux.kernel
Subject	perf fails to mmap data file (JFFS2)
Date	2015-09-03 10:00 +0200
Message-ID	<q4xB8-5Ju-13@gated-at.bofh.it> (permalink)
Organization	linux.* mail to news gateway

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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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perf fails to mmap data file (JFFS2) Kenth Eriksson <kenth.eriksson@transmode.com> - 2015-09-03 10:00 +0200
  Re: perf fails to mmap data file (JFFS2) Andi Kleen <andi@firstfloor.org> - 2015-09-03 21:00 +0200
    [PATCH] Fix mmap error for perf data file. Not all file systems, e.g. JFFS2, support MAP_SHARED. Kenth Eriksson <kenth.eriksson@transmode.com> - 2015-09-04 09:10 +0200

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