On Fri, Jul 01, 2022 at 11:58:35AM +0800, Ming Lei wrote:
> Why do we need to pay the cost(4 bytes added to bio and the updating
> in absolutely fast path) if rewind isn't used? So far, only dm requeue
> needs it, and it is one very unusual event.
>
> Assuming fixed bio end sector should cover
On Wed, Jun 29, 2022 at 09:14:54PM -0400, Kent Overstreet wrote:
> On Thu, Jun 30, 2022 at 08:47:13AM +0800, Ming Lei wrote:
> > Or if I misunderstood your point, please cook a patch and I am happy to
> > take a close look, and posting one very raw idea with random data
> > structure looks not
On Wed, Jun 29, 2022 at 11:16:10AM -0600, Jens Axboe wrote:
> Not sure what Christoph change you are referring to, but all the ones
> that I did to improve the init side were all backed by numbers I ran at
> that time (and most/all of the commit messages will have that data). So
> yes, it is
On Wed, Jun 29, 2022 at 01:00:52PM -0600, Jens Axboe wrote:
> On 6/29/22 12:40 PM, Kent Overstreet wrote:
> > On Wed, Jun 29, 2022 at 11:16:10AM -0600, Jens Axboe wrote:
> >> Not sure what Christoph change you are referring to, but all the ones
> >> that I did to improve the init side were all
On Wed, Jun 29, 2022 at 12:37:59PM -0700, Bart Van Assche wrote:
> On 6/29/22 12:05, Kent Overstreet wrote:
> > On Wed, Jun 29, 2022 at 11:51:27AM -0700, Bart Van Assche wrote:
> > > On 6/29/22 11:40, Kent Overstreet wrote:
> > > > But Jens, to be blunt - I know we have different priorities in the
On Wed, Jun 29, 2022 at 11:51:27AM -0700, Bart Van Assche wrote:
> On 6/29/22 11:40, Kent Overstreet wrote:
> > But Jens, to be blunt - I know we have different priorities in the way we
> > write code.
>
> Please stay professional in your communication and focus on the technical
> issues instead
On Thu, Jun 30, 2022 at 08:47:13AM +0800, Ming Lei wrote:
> Or if I misunderstood your point, please cook a patch and I am happy to
> take a close look, and posting one very raw idea with random data
> structure looks not helpful much for this discussion technically.
Based it on your bio_rewind()
On Wed, Jun 29, 2022 at 02:07:08AM -0400, Mike Snitzer wrote:
> Please try to dial down the hyperbole and judgment. Ming wrote this
> code. And you haven't been able to point out anything _actually_ wrong
> with it (yet).
>
> This patch's header does need editing for clarity, but we can help
>
On Thu, Jun 30, 2022 at 08:47:13AM +0800, Ming Lei wrote:
> What is the difference between bio_set_pos and bio_rewind()? Both have
> to restore bio->bi_iter(the sector part and the bvec part).
>
> Also how to update ->bi_done which 'counts bytes advanced'? You meant doing
> it in
> very
On Wed, Jun 29, 2022 at 12:37:59PM -0700, Bart Van Assche wrote:
> On 6/29/22 12:05, Kent Overstreet wrote:
> > On Wed, Jun 29, 2022 at 11:51:27AM -0700, Bart Van Assche wrote:
> > > On 6/29/22 11:40, Kent Overstreet wrote:
> > > > But Jens, to be blunt - I know we have different priorities in the
On Wed, Jun 29, 2022 at 02:11:54PM -0400, Kent Overstreet wrote:
> On Wed, Jun 29, 2022 at 02:07:08AM -0400, Mike Snitzer wrote:
> > Please try to dial down the hyperbole and judgment. Ming wrote this
> > code. And you haven't been able to point out anything _actually_ wrong
> > with it (yet).
> >
On Jun 29, 2022, at 1:26 PM, Kent Overstreet wrote:
>
> On Wed, Jun 29, 2022 at 01:00:52PM -0600, Jens Axboe wrote:
>>> On 6/29/22 12:40 PM, Kent Overstreet wrote:
>>> On Wed, Jun 29, 2022 at 11:16:10AM -0600, Jens Axboe wrote:
Not sure what Christoph change you are referring to, but all
On 6/29/22 12:05, Kent Overstreet wrote:
On Wed, Jun 29, 2022 at 11:51:27AM -0700, Bart Van Assche wrote:
On 6/29/22 11:40, Kent Overstreet wrote:
But Jens, to be blunt - I know we have different priorities in the way we write
code.
Please stay professional in your communication and focus
On 6/29/22 11:40, Kent Overstreet wrote:
But Jens, to be blunt - I know we have different priorities in the way we write
code.
Please stay professional in your communication and focus on the
technical issues instead of on the people involved.
BTW, I remember that some time ago I bisected a
On 6/29/22 12:40 PM, Kent Overstreet wrote:
> On Wed, Jun 29, 2022 at 11:16:10AM -0600, Jens Axboe wrote:
>> Not sure what Christoph change you are referring to, but all the ones
>> that I did to improve the init side were all backed by numbers I ran at
>> that time (and most/all of the commit
On 6/28/22 12:32 PM, Kent Overstreet wrote:
> On Tue, Jun 28, 2022 at 12:13:06PM -0600, Jens Axboe wrote:
>> It's much less about using whatever amount of memory for inflight IO,
>> and much more about not bloating fast path structures (of which the
>> bio is certainly one). All of this gunk has
On Tue, Jun 28, 2022 at 01:41:12PM -0400, Mike Snitzer wrote:
> On Tue, Jun 28 2022 at 12:36P -0400,
> Kent Overstreet wrote:
>
> > On Tue, Jun 28, 2022 at 03:49:28PM +0800, Ming Lei wrote:
> > > On Tue, Jun 28, 2022 at 12:26:10AM -0400, Kent Overstreet wrote:
> > > > On Mon, Jun 27, 2022 at
On Tue, Jun 28, 2022 at 03:49:28PM +0800, Ming Lei wrote:
> On Tue, Jun 28, 2022 at 12:26:10AM -0400, Kent Overstreet wrote:
> > On Mon, Jun 27, 2022 at 03:36:22PM +0800, Ming Lei wrote:
> > > Not mention bio_iter, bvec_iter has been 32 bytes, which is too big to
> > > hold in per-io data
On Tue, Jun 28, 2022 at 12:13:06PM -0600, Jens Axboe wrote:
> It's much less about using whatever amount of memory for inflight IO,
> and much more about not bloating fast path structures (of which the bio
> is certainly one). All of this gunk has to be initialized for each IO,
> and that's the
On Tue, Jun 28, 2022 at 03:42:52PM +0800, Ming Lei wrote:
> I don't see there is 'queue depth' for bio or bio driver.
>
> 32 bytes have been big, and memory footprint is increased too since the data
> has been
> prepared for the future possible rewind. If crypt or integrity is considered,
> it
On Tue, Jun 28 2022 at 1:52P -0400,
Kent Overstreet wrote:
> On Tue, Jun 28, 2022 at 01:41:12PM -0400, Mike Snitzer wrote:
> > On Tue, Jun 28 2022 at 12:36P -0400,
> > Kent Overstreet wrote:
> >
> > > On Tue, Jun 28, 2022 at 03:49:28PM +0800, Ming Lei wrote:
> > > > On Tue, Jun 28, 2022 at
On Tue, Jun 28, 2022 at 12:36:17PM -0400, Kent Overstreet wrote:
> On Tue, Jun 28, 2022 at 03:49:28PM +0800, Ming Lei wrote:
> > On Tue, Jun 28, 2022 at 12:26:10AM -0400, Kent Overstreet wrote:
> > > On Mon, Jun 27, 2022 at 03:36:22PM +0800, Ming Lei wrote:
> > > > Not mention bio_iter, bvec_iter
On Tue, Jun 28, 2022 at 12:13:06PM -0600, Jens Axboe wrote:
> On 6/27/22 10:20 PM, Kent Overstreet wrote:
> > On Mon, Jun 27, 2022 at 03:36:22PM +0800, Ming Lei wrote:
> >> On Sun, Jun 26, 2022 at 04:14:58PM -0400, Kent Overstreet wrote:
> >>> On Fri, Jun 24, 2022 at 10:12:52PM +0800, Ming Lei
On 6/27/22 10:20 PM, Kent Overstreet wrote:
> On Mon, Jun 27, 2022 at 03:36:22PM +0800, Ming Lei wrote:
>> On Sun, Jun 26, 2022 at 04:14:58PM -0400, Kent Overstreet wrote:
>>> On Fri, Jun 24, 2022 at 10:12:52PM +0800, Ming Lei wrote:
Commit 7759eb23fd98 ("block: remove bio_rewind_iter()")
On Tue, Jun 28 2022 at 12:36P -0400,
Kent Overstreet wrote:
> On Tue, Jun 28, 2022 at 03:49:28PM +0800, Ming Lei wrote:
> > On Tue, Jun 28, 2022 at 12:26:10AM -0400, Kent Overstreet wrote:
> > > On Mon, Jun 27, 2022 at 03:36:22PM +0800, Ming Lei wrote:
> > > > Not mention bio_iter, bvec_iter has
On Tue, Jun 28, 2022 at 12:26:10AM -0400, Kent Overstreet wrote:
> On Mon, Jun 27, 2022 at 03:36:22PM +0800, Ming Lei wrote:
> > Not mention bio_iter, bvec_iter has been 32 bytes, which is too big to
> > hold in per-io data structure. With this patch, 8bytes is enough
> > to rewind one bio if the
On Tue, Jun 28, 2022 at 12:20:16AM -0400, Kent Overstreet wrote:
> On Mon, Jun 27, 2022 at 03:36:22PM +0800, Ming Lei wrote:
> > On Sun, Jun 26, 2022 at 04:14:58PM -0400, Kent Overstreet wrote:
> > > On Fri, Jun 24, 2022 at 10:12:52PM +0800, Ming Lei wrote:
> > > > Commit 7759eb23fd98 ("block:
On Fri, Jun 24, 2022 at 10:12:52PM +0800, Ming Lei wrote:
> Commit 7759eb23fd98 ("block: remove bio_rewind_iter()") removes
> the similar API because the following reasons:
>
> ```
> It is pointed that bio_rewind_iter() is one very bad API[1]:
>
> 1) bio size may not be restored
On Mon, Jun 27, 2022 at 03:36:22PM +0800, Ming Lei wrote:
> On Sun, Jun 26, 2022 at 04:14:58PM -0400, Kent Overstreet wrote:
> > On Fri, Jun 24, 2022 at 10:12:52PM +0800, Ming Lei wrote:
> > > Commit 7759eb23fd98 ("block: remove bio_rewind_iter()") removes
> > > the similar API because the
On Mon, Jun 27, 2022 at 03:36:22PM +0800, Ming Lei wrote:
> Not mention bio_iter, bvec_iter has been 32 bytes, which is too big to
> hold in per-io data structure. With this patch, 8bytes is enough
> to rewind one bio if the end sector is fixed.
And with rewind, you're making an assumption about
On Sun, Jun 26, 2022 at 02:37:22PM -0700, Eric Biggers wrote:
> On Fri, Jun 24, 2022 at 10:12:52PM +0800, Ming Lei wrote:
> > diff --git a/block/blk-crypto.c b/block/blk-crypto.c
> > index a496aaef85ba..caae2f429fc7 100644
> > --- a/block/blk-crypto.c
> > +++ b/block/blk-crypto.c
> > @@ -134,6
On Sun, Jun 26, 2022 at 04:14:58PM -0400, Kent Overstreet wrote:
> On Fri, Jun 24, 2022 at 10:12:52PM +0800, Ming Lei wrote:
> > Commit 7759eb23fd98 ("block: remove bio_rewind_iter()") removes
> > the similar API because the following reasons:
> >
> > ```
> > It is pointed that
On Fri, Jun 24, 2022 at 10:12:52PM +0800, Ming Lei wrote:
> diff --git a/block/blk-crypto.c b/block/blk-crypto.c
> index a496aaef85ba..caae2f429fc7 100644
> --- a/block/blk-crypto.c
> +++ b/block/blk-crypto.c
> @@ -134,6 +134,21 @@ void bio_crypt_dun_increment(u64
>
Commit 7759eb23fd98 ("block: remove bio_rewind_iter()") removes
the similar API because the following reasons:
```
It is pointed that bio_rewind_iter() is one very bad API[1]:
1) bio size may not be restored after rewinding
2) it causes some bogus change, such as 5151842b9d8732
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