motorhead/qemu
1
0
Fork 0
mirror of https://github.com/Motorhead1991/qemu.git synced 2025-07-26 20:03:54 -06:00
Code Issues Projects Releases Packages Wiki Activity Actions

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

Browse source 
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
Download patch file Download diff file Expand all files Collapse all files

9
util/async.c
View file

@ -57,6 +57,7 @@ enum {
struct QEMUBH {
AioContext *ctx;
const char *name;
QEMUBHFunc *cb;
void *opaque;
QSLIST_ENTRY(QEMUBH) next;
@ -107,7 +108,8 @@ static QEMUBH *aio_bh_dequeue(BHList *head, unsigned *flags)
return bh;
}
void aio_bh_schedule_oneshot(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
void aio_bh_schedule_oneshot_full(AioContext *ctx, QEMUBHFunc *cb,
void *opaque, const char *name)
{
QEMUBH *bh;
bh = g_new(QEMUBH, 1);
@ -115,11 +117,13 @@ void aio_bh_schedule_oneshot(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
.ctx = ctx,
.cb = cb,
.opaque = opaque,
.name = name,
};
aio_bh_enqueue(bh, BH_SCHEDULED | BH_ONESHOT);
}
QEMUBH *aio_bh_new(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
QEMUBH *aio_bh_new_full(AioContext *ctx, QEMUBHFunc *cb, void *opaque,
const char *name)
{
QEMUBH *bh;
bh = g_new(QEMUBH, 1);
@ -127,6 +131,7 @@ QEMUBH *aio_bh_new(AioContext *ctx, QEMUBHFunc *cb, void *opaque)
.ctx = ctx,
.cb = cb,
.opaque = opaque,
.name = name,
};
return bh;
}