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util/async: add a human-readable name to BHs for debugging

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It can be difficult to debug issues with BHs in production environments.
Although BHs can usually be identified by looking up their ->cb()
function pointer, this requires debug information for the program. It is
also not possible to print human-readable diagnostics about BHs because
they have no identifier.

This patch adds a name to each BH. The name is not unique per instance
but differentiates between cb() functions, which is usually enough. It's
done by changing aio_bh_new() and friends to macros that stringify cb.

The next patch will use the name field when reporting leaked BHs.

Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com>
Message-Id: <20210414200247.917496-2-stefanha@redhat.com>
This commit is contained in:
Stefan Hajnoczi 2021-04-14 21:02:46 +01:00
parent 711c0418c8
commit 0f08586c71
5 changed files with 43 additions and 11 deletions
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4
include/qemu/main-loop.h
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@ -294,7 +294,9 @@ void qemu_cond_timedwait_iothread(QemuCond *cond, int ms);
void qemu_fd_register(int fd);
QEMUBH *qemu_bh_new(QEMUBHFunc *cb, void *opaque);
#define qemu_bh_new(cb, opaque) \
qemu_bh_new_full((cb), (opaque), (stringify(cb)))
QEMUBH *qemu_bh_new_full(QEMUBHFunc *cb, void *opaque, const char *name);
void qemu_bh_schedule_idle(QEMUBH *bh);
enum {