From: Christoph Hellwig <hch@lst.de>
To: Keith Busch <kbusch@kernel.org>
Cc: Christoph Hellwig <hch@lst.de>,
John Garry <john.garry@huawei.com>,
axboe@fb.com, sagi@grimberg.me, linux-nvme@lists.infradead.org,
linux-kernel@vger.kernel.org
Subject: Re: [PATCH] nvme: Fix nvme_setup_command metadata trace event for cdw10
Date: Wed, 6 Jul 2022 18:34:34 +0200 [thread overview]
Message-ID: <20220706163434.GA2222@lst.de> (raw)
In-Reply-To: <YsW3oXcCe6/y6iRb@kbusch-mbp.dhcp.thefacebook.com>
On Wed, Jul 06, 2022 at 10:26:09AM -0600, Keith Busch wrote:
> On Wed, Jul 06, 2022 at 06:18:25PM +0200, Christoph Hellwig wrote:
> > On Wed, Jul 06, 2022 at 10:13:22AM -0600, Keith Busch wrote:
> > > Did you test what the trace looks like afte this? We're losing valuable trace
> > > data here. The field is supposed to get CDW's 10 - 15, so that's 24 bytes. I
> > > don't know why it cares that the address of the field being read is only 4
> > > bytes; we want everything that comes after it too.
> >
> > Because accesses should not spawn boundaries of members in structs unless
> > copying the entire struct. If we want to trace the various fields we
> > need to individually assign them.
> >
> > Anyway, I'm dropping this patch from nvme-5.19 for now to let the
> > discussion conclude.
>
> How about this instead?
Maybe a better option would be to use struct_group().
next prev parent reply other threads:[~2022-07-06 16:34 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-07-06 8:16 [PATCH] nvme: Fix nvme_setup_command metadata trace event for cdw10 John Garry
2022-07-06 16:10 ` Christoph Hellwig
2022-07-06 16:13 ` Keith Busch
2022-07-06 16:18 ` Christoph Hellwig
2022-07-06 16:26 ` Keith Busch
2022-07-06 16:34 ` Christoph Hellwig [this message]
2022-07-06 16:44 ` Keith Busch
2022-07-06 16:58 ` John Garry
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