perf fails to mmap data file (JFFS2)

From: Kenth Eriksson
Date: Thu Sep 03 2015 - 03:50:18 EST

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?


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