From: "FENG ZHOU" <zhfeng.osprey@gmail.com>
To: linux-kernel@vger.kernel.org
Subject: How to optimize system time for such case?
Date: Thu, 2 Nov 2006 16:52:48 +0800 [thread overview]
Message-ID: <b3c691930611020052k4cee7582lf58942c1b1151916@mail.gmail.com> (raw)
In-Reply-To: <b3c691930611020047p4a59206aj3fc3060e2f74e426@mail.gmail.com>
Hello, all
I am optimizing a compiler and I believe there is a bug in such
compile. Currently, I have a test case, which is a scientific
application, has a lot of system time. This is weird, because this
case does not have many system calls. Meanwhile, compiled at another
option, I found all the "system time" are gone! So, I assume there is
some problem in the first one (though both binary produce correct
result). I used some performance tuning tool and found the hottest
address for CPU privilege level change event is: 0xa000000100001a70.
This address is not in code or data segment. Now, I am kinda stuck
here. My question is: how to find what this address is? Or find out
what is the cause of the "system time"? Thanks in advance.
PS: the platform is Itanium 2.
-Feng
next parent reply other threads:[~2006-11-02 8:52 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <b3c691930611020047p4a59206aj3fc3060e2f74e426@mail.gmail.com>
2006-11-02 8:52 ` FENG ZHOU [this message]
2006-11-02 12:34 ` Livio Soares
2006-11-02 9:10 Daniel J Blueman
[not found] ` <b3c691930611020116n6ee14112lff7632be72e7df71@mail.gmail.com>
2006-11-02 9:27 ` Daniel J Blueman
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