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trace: add "-trace enable=..."

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Allow enabling events without going through a file, for example:

   qemu-system-x86_64 -trace bdrv_aio_writev -trace bdrv_aio_readv

or with globbing too:

   qemu-system-x86_64 -trace 'bdrv_aio_*'

if an appropriate backend is enabled (simple, stderr, ftrace).

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Denis V. Lunev <den@openvz.org>
Acked-by: Christian Borntraeger <borntraeger@de.ibm.com>
Message-id: 1452174932-28657-6-git-send-email-den@openvz.org
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
This commit is contained in:
Paolo Bonzini
2016-01-07 16:55:26 +03:00
committed by Stefan Hajnoczi
parent f246b86672
commit 10578a257d
4 changed files with 54 additions and 24 deletions
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9
trace/control.h
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@ -181,6 +181,15 @@ void trace_init_events(const char *file);
*/
void trace_init_file(const char *file);
/**
* trace_enable_events:
* @line_buf: A string with a glob pattern of events to be enabled or,
* if the string starts with '-', disabled.
*
* Enable or disable matching events.
*/
void trace_enable_events(const char *line_buf);
#include "trace/control-internal.h"