linux-kernel - Re: [PATCH 0/2] optimise iov

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Message-ID: <629cabf2-3a23-9d95-dd88-281ef4d49ddd@gmail.com>
Date:   Thu, 19 Nov 2020 17:14:41 +0000
From:   Pavel Begunkov <asml.silence@...il.com>
To:     Jens Axboe <axboe@...nel.dk>, linux-block@...r.kernel.org,
        Alexander Viro <viro@...iv.linux.org.uk>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 0/2] optimise iov_iter

On 19/11/2020 16:46, Jens Axboe wrote:
> On 11/19/20 8:29 AM, Pavel Begunkov wrote:
>> The first patch optimises iov_iter_npages() for the bvec case, and the
>> second helps code generation to kill unreachable code.
>>
>> Pavel Begunkov (2):
>>   iov_iter: optimise iov_iter_npages for bvec
>>   iov_iter: optimise iter type checking
>>
>>  include/linux/uio.h | 10 +++++-----
>>  lib/iov_iter.c      | 10 +++++-----
>>  2 files changed, 10 insertions(+), 10 deletions(-)
> 
> Nice! Tested this and confirmed both the better code generation,
> and reduction in overhead in iov_iter_npages().

Thanks! Did you find t-put/etc. boost with your setup?

> 
> Reviewed-by: Jens Axboe <axboe@...nel.dk>

-- 
Pavel Begunkov