linux-kernel - [PATCH 38/38] perf symbols: Add description of JIT interface

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Message-Id: <1344883039-13495-39-git-send-email-acme@infradead.org>
Date:	Mon, 13 Aug 2012 15:37:19 -0300
From:	Arnaldo Carvalho de Melo <acme@...radead.org>
To:	Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, Andi Kleen <ak@...ux.intel.com>,
	Pekka Enberg <penberg@...helsinki.fi>,
	Arnaldo Carvalho de Melo <acme@...hat.com>
Subject: [PATCH 38/38] perf symbols: Add description of JIT interface

From: Andi Kleen <ak@...ux.intel.com>

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 <ak@...ux.intel.com>
Acked-by: Pekka Enberg <penberg@...helsinki.fi>
Cc: Pekka Enberg <penberg@...helsinki.fi>
Link: http://lkml.kernel.org/r/1344526260-18721-1-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@...hat.com>
---
 tools/perf/Documentation/jit-interface.txt |   15 +++++++++++++++
 1 files changed, 15 insertions(+), 0 deletions(-)
 create mode 100644 tools/perf/Documentation/jit-interface.txt

diff --git a/tools/perf/Documentation/jit-interface.txt b/tools/perf/Documentation/jit-interface.txt
new file mode 100644
index 0000000..a8656f5
--- /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.
-- 
1.7.1

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