From: Andi Kleen <andi@firstfloor.org>
To: peterz@infradead.org
Cc: x86@kernel.org, linux-kernel@vger.kernel.org
Subject: Updated perf backtrace improvement patchkit
Date: Fri, 10 Oct 2014 16:25:13 -0700 [thread overview]
Message-ID: <1412983517-12419-1-git-send-email-andi@firstfloor.org> (raw)
I reworked the patchkit to speed up perf backtracing based on
the feedback. It now uses a new method to determine the kernel
addresses using the page tables, and also avoids using copy_*_user
in the backtrace at all.
The goal is to avoid perf exceeding the NMI handler CPU time quota.
In addition this patchkit also optimizes the generic fault handling
for one case in copy_*_user (running on systems with enhanced copy
string)
Hopefully this version is more acceptable.
-Andi
next reply other threads:[~2014-10-10 23:25 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-10 23:25 Andi Kleen [this message]
2014-10-10 23:25 ` [PATCH 1/4] Move pagefault_enable/disable to own include file Andi Kleen
2014-10-10 23:25 ` [PATCH 2/4] x86: Move copy_from_user_nmi() inline Andi Kleen
2014-10-10 23:25 ` [PATCH 3/4] x86: Optimize enhanced copy user fault handling Andi Kleen
2014-10-10 23:25 ` [PATCH 4/4] x86: Use the page tables to look up kernel addresses in backtrace Andi Kleen
2014-10-11 0:24 ` Chuck Ebbert
2014-10-11 0:33 ` Eric Dumazet
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