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qsp: track BQL callers explicitly

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The BQL is acquired via qemu_mutex_lock_iothread(), which makes
the profiler assign the associated wait time (i.e. most of
BQL wait time) entirely to that function. This loses the original
call site information, which does not help diagnose BQL contention.
Fix it by tracking the callers explicitly.

Signed-off-by: Emilio G. Cota <cota@braap.org>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Emilio G. Cota 2017-10-28 02:16:41 -04:00 • committed by Paolo Bonzini
parent d557de4a0e
commit cb764d0665
5 changed files with 19 additions and 4 deletions
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4
include/qemu/main-loop.h
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@ -276,7 +276,9 @@ bool qemu_mutex_iothread_locked(void);
* NOTE: tools currently are single-threaded and qemu_mutex_lock_iothread
* is a no-op there.
*/
void qemu_mutex_lock_iothread(void);
#define qemu_mutex_lock_iothread() \
qemu_mutex_lock_iothread_impl(__FILE__, __LINE__)
void qemu_mutex_lock_iothread_impl(const char *file, int line);
/**
* qemu_mutex_unlock_iothread: Unlock the main loop mutex.