On Sat, 9 Jan 2021 15:53:27 +, Pavel Begunkov wrote:
> iov_iter_bvec() initialises iterators well, no need to pre-zero it
> beforehand as done in fd_execute_rw_aio(). Compilers can't optimise it
> out and generate extra code for that (confirmed with assembly).
Applied to 5.12/scsi-queue,
Pavel,
> iov_iter_bvec() initialises iterators well, no need to pre-zero it
> beforehand as done in fd_execute_rw_aio(). Compilers can't optimise it
> out and generate extra code for that (confirmed with assembly).
Applied to 5.12/scsi-staging, thanks!
--
Martin K. Petersen Oracle Linux
On 11/01/2021 05:23, Chaitanya Kulkarni wrote:
> On 1/10/21 18:32, Pavel Begunkov wrote:
>> On 11/01/2021 02:06, Chaitanya Kulkarni wrote:
>>> On 1/9/21 13:29, Pavel Begunkov wrote:
On 09/01/2021 20:52, Chaitanya Kulkarni wrote:
> On 1/9/21 12:40, Pavel Begunkov wrote:
>> I expect you
On 1/10/21 18:32, Pavel Begunkov wrote:
> On 11/01/2021 02:06, Chaitanya Kulkarni wrote:
>> On 1/9/21 13:29, Pavel Begunkov wrote:
>>> On 09/01/2021 20:52, Chaitanya Kulkarni wrote:
On 1/9/21 12:40, Pavel Begunkov wrote:
> I expect you won't find any, but such little things can pile up
On 1/9/21 7:53 AM, Pavel Begunkov wrote:
> iov_iter_bvec() initialises iterators well, no need to pre-zero it
> beforehand as done in fd_execute_rw_aio(). Compilers can't optimise it
> out and generate extra code for that (confirmed with assembly).
Reviewed-by: Bart Van Assche
On 11/01/2021 02:06, Chaitanya Kulkarni wrote:
> On 1/9/21 13:29, Pavel Begunkov wrote:
>> On 09/01/2021 20:52, Chaitanya Kulkarni wrote:
>>> On 1/9/21 12:40, Pavel Begunkov wrote:
I expect you won't find any, but such little things can pile up
into a not-easy-to-spot overhead over time.
On 1/9/21 13:29, Pavel Begunkov wrote:
> On 09/01/2021 20:52, Chaitanya Kulkarni wrote:
>> On 1/9/21 12:40, Pavel Begunkov wrote:
>>> I expect you won't find any, but such little things can pile up
>>> into a not-easy-to-spot overhead over time.
>> That is what I suspected with the resulting
On 09/01/2021 20:52, Chaitanya Kulkarni wrote:
> On 1/9/21 12:40, Pavel Begunkov wrote:
>> I expect you won't find any, but such little things can pile up
>> into a not-easy-to-spot overhead over time.
>
> That is what I suspected with the resulting assembly. The commit log
> needs to document
On 1/9/21 12:40, Pavel Begunkov wrote:
> I expect you won't find any, but such little things can pile up
> into a not-easy-to-spot overhead over time.
That is what I suspected with the resulting assembly. The commit log
needs to document that there is no direct impact on the performance
which can
On 09/01/2021 20:09, Chaitanya Kulkarni wrote:
> On 1/9/21 07:59, Pavel Begunkov wrote:
>> iov_iter_bvec() initialises iterators well, no need to pre-zero it
>> beforehand as done in fd_execute_rw_aio(). Compilers can't optimise it
>> out and generate extra code for that (confirmed with assembly).
On 1/9/21 07:59, Pavel Begunkov wrote:
> iov_iter_bvec() initialises iterators well, no need to pre-zero it
> beforehand as done in fd_execute_rw_aio(). Compilers can't optimise it
> out and generate extra code for that (confirmed with assembly).
It will be great if we can quantify this
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