From: Andi Kleen Date: Thu, 9 Aug 2012 15:31:00 +0000 (-0700) Subject: perf symbols: Add description of JIT interface X-Git-Tag: firefly_0821_release~3680^2~1401^2~73^2~24 X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=0fe7d7e9761ec7e23350b5543ddac470bb3cde1e;p=firefly-linux-kernel-4.4.55.git perf symbols: Add description of JIT interface Add a description of the JIT interface in the perf symbol resolution code. I reverse engineered the format from the source. Signed-off-by: Andi Kleen Acked-by: Pekka Enberg Cc: Pekka Enberg Link: http://lkml.kernel.org/r/1344526260-18721-1-git-send-email-andi@firstfloor.org Signed-off-by: Arnaldo Carvalho de Melo --- diff --git a/tools/perf/Documentation/jit-interface.txt b/tools/perf/Documentation/jit-interface.txt new file mode 100644 index 000000000000..a8656f564915 --- /dev/null +++ b/tools/perf/Documentation/jit-interface.txt @@ -0,0 +1,15 @@ +perf supports a simple JIT interface to resolve symbols for dynamic code generated +by a JIT. + +The JIT has to write a /tmp/perf-%d.map (%d = pid of process) file + +This is a text file. + +Each line has the following format, fields separated with spaces: + +START SIZE symbolname + +START and SIZE are hex numbers without 0x. +symbolname is the rest of the line, so it could contain special characters. + +The ownership of the file has to match the process.