path: root/tools/perf/Documentation/jit-interface.txt
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authorAndi Kleen <>2012-08-09 08:31:00 -0700
committerArnaldo Carvalho de Melo <>2012-08-13 14:55:02 -0300
commit0fe7d7e9761ec7e23350b5543ddac470bb3cde1e (patch)
tree2ed713988e611e731b5cce1aba1f907b64018383 /tools/perf/Documentation/jit-interface.txt
parent3aafe5ae08f2aed378e06d78b207883879d25cbe (diff)
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: Signed-off-by: Arnaldo Carvalho de Melo <>
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+perf supports a simple JIT interface to resolve symbols for dynamic code generated
+by a JIT.
+The JIT has to write a /tmp/ (%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.