Hi, I'm trying to run powertop on an ARM system which is using page size of 64k and I get segmentation fault. The seg fault is a result of failure in mmap of 8M (128 pages), It seems there are many mmap like this going on... Below is a small patch that reduce the amount of mmaped memory based on the system page size. Subject: [PATCH] Limit number of mmaped pages Reduce number of pages mmaped, to prevent segmentation fault, when system uses page size bigger than 4k. Signed-off-by: Ronen Shitrit <rshitrit(a)annapurnalabs.com&gt; --- src/perf/perf.cpp | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/src/perf/perf.cpp b/src/perf/perf.cpp index b1103a7..b4d026f 100644 --- a/src/perf/perf.cpp +++ b/src/perf/perf.cpp @@ -207,7 +207,7 @@ perf_event::perf_event(void) allocate_pevent(); name = NULL; perf_fd = -1; - bufsize = 128; + bufsize = 128 * 4096 / getpagesize(); perf_mmap = NULL; cpu = 0; trace_type = 0; -- 1.9.1 -- Ronen Shitrit