Re: perf fails to mmap data file (JFFS2)

From: Andi Kleen
Date: Thu Sep 03 2015 - 14:57:45 EST

Kenth Eriksson <kenth.eriksson@xxxxxxxxxxxxx> 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.

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