* 4.14: can bcc not trace blk-mq?
@ 2017-11-20 18:19 Holger Hoffstätte
2017-11-20 21:34 ` Holger Hoffstätte
0 siblings, 1 reply; 2+ messages in thread
From: Holger Hoffstätte @ 2017-11-20 18:19 UTC (permalink / raw)
To: linux-block
Sorry if this is a dumb question, but I've started playing with bcc
(release 0.4.0) and can trace everything (cpu, xfs, net..) so it works
fine - except apparently block traffic. I've tried all the bio* tools
and none of them seem to trace/collect anything, despite the fact
that they contain blk-mq tracepoint references.
I have set CONFIG_SCSI_MQ_DEFAULT=y and everything works fine otherwise.
Is this supposed to work, broken in bcc/blk-mq/something else?
Haven't tried to boot with scsi_mod.use_blk_mq=0 yet, just wanted
to ping for possible confirmation.
Thanks,
Holger
^ permalink raw reply [flat|nested] 2+ messages in thread
* Re: 4.14: can bcc not trace blk-mq?
2017-11-20 18:19 4.14: can bcc not trace blk-mq? Holger Hoffstätte
@ 2017-11-20 21:34 ` Holger Hoffstätte
0 siblings, 0 replies; 2+ messages in thread
From: Holger Hoffstätte @ 2017-11-20 21:34 UTC (permalink / raw)
To: linux-block
On Mon, 20 Nov 2017 18:19:37 +0000, Holger Hoffstätte wrote:
> Sorry if this is a dumb question, but I've started playing with bcc
> (release 0.4.0) and can trace everything (cpu, xfs, net..) so it works
> fine - except apparently block traffic. I've tried all the bio* tools
> and none of them seem to trace/collect anything, despite the fact
> that they contain blk-mq tracepoint references.
> I have set CONFIG_SCSI_MQ_DEFAULT=y and everything works fine otherwise.
> Is this supposed to work, broken in bcc/blk-mq/something else?
> Haven't tried to boot with scsi_mod.use_blk_mq=0 yet, just wanted
> to ping for possible confirmation.
Disabling blk-mq didn't help at all either, and since the bcc-provided
docker image doesn't work either I guess it's just broken.
-h
^ permalink raw reply [flat|nested] 2+ messages in thread
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