From: Paolo Bonzini <pbonzini@redhat.com>
To: qemu-devel@nongnu.org
Cc: stefanha@redhat.com
Subject: [Qemu-devel] [PATCH for-2.5 0/2] trace: decrease overhead of simpletrace and stderr backends
Date: Wed, 28 Oct 2015 07:06:25 +0100 [thread overview]
Message-ID: <1446012388-9586-1-git-send-email-pbonzini@redhat.com> (raw)
This patch series makes it faster for simpletrace and stderr backends
to discard disabled events. This is done in two ways: patch 1 makes
the common case of no enabled events faster; patch 2 makes the other
case less heavy on the data cache by packing the "tracepoint enabled"
flag and avoiding useless pointer chasing.
This should decrease the impact of changing the default tracing backend
to stderr aka log, which Peter suggested could be a problem.
Paolo
Paolo Bonzini (2):
trace: count number of enabled events
trace: track enabled events in a separate array
scripts/tracetool/format/events_c.py | 2 +-
trace/control-internal.h | 15 ++++++++++++---
trace/control.c | 3 +++
trace/control.h | 2 +-
trace/event-internal.h | 2 --
5 files changed, 17 insertions(+), 7 deletions(-)
--
2.5.0
next reply other threads:[~2015-10-28 6:06 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2015-10-28 6:06 Paolo Bonzini [this message]
2015-10-28 6:06 ` [Qemu-devel] [PATCH 1/2] trace: count number of enabled events Paolo Bonzini
2015-10-28 6:06 ` [Qemu-devel] [PATCH 2/2] trace: track enabled events in a separate array Paolo Bonzini
2015-10-28 14:44 ` [Qemu-devel] [PATCH for-2.5 0/2] trace: decrease overhead of simpletrace and stderr backends Stefan Hajnoczi
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