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[Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?

From: Wei-Ren Chen
Subject: [Qemu-devel] How to measure guest memory access (qemu_ld/qemu_st) time?
Date: Wed, 13 Jun 2012 11:14:26 +0800
User-agent: Mutt/1.5.21 (2010-09-15)

Hi all,

  I suspect that guest memory access (qemu_ld/qemu_st) account for the major of
time spent in system mode. I would like to know precisely how much (if 
We use tools like perf [1] before, but since the logic of guest memory access 
embedded in the host binary not only helper functions, the result cannot be
relied. The current idea is adding helper functions before/after guest memory
access logic. Take ARM guest on x86_64 host for example, should I add the helper
functions before/after tcg_gen_qemu_{ld,st} in target-arm/translate.c or
tcg_out_qemu_{ld,st} in tcg/i386/tcg-target.c? Or there is a better way to know
how much time QEMU spend on handling guest memory access?

  Any suggestion/comment is welcomed. Thanks!


[1] https://perf.wiki.kernel.org/index.php/Main_Page

Wei-Ren Chen (陳韋任)
Computer Systems Lab, Institute of Information Science,
Academia Sinica, Taiwan (R.O.C.)
Tel:886-2-2788-3799 #1667
Homepage: http://people.cs.nctu.edu.tw/~chenwj

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