Re: [PATCHSET v5 0/12] Add support for async buffered reads

From: Jens Axboe <axboe@kernel.dk>
To: sedat.dilek@gmail.com
Cc: io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org,
	linux-kernel@vger.kernel.org, linux-mm@kvack.org,
	akpm@linux-foundation.org
Subject: Re: [PATCHSET v5 0/12] Add support for async buffered reads
Date: Mon, 1 Jun 2020 08:46:36 -0600	[thread overview]
Message-ID: <412ec6a7-90c9-5856-bafe-12c8fe2135e7@kernel.dk> (raw)
In-Reply-To: <CA+icZUVVL4W46Df5=eQVsb8S6A=_A0ho0jFVf3mde1wpx7kynQ@mail.gmail.com>

On 6/1/20 8:43 AM, Sedat Dilek wrote:
> On Mon, Jun 1, 2020 at 4:35 PM Jens Axboe <axboe@kernel.dk> wrote:
>>
>> On 6/1/20 8:14 AM, Jens Axboe wrote:
>>> On 6/1/20 8:13 AM, Sedat Dilek wrote:
>>>> On Mon, Jun 1, 2020 at 4:04 PM Jens Axboe <axboe@kernel.dk> wrote:
>>>>>
>>>>> On 6/1/20 7:35 AM, Sedat Dilek wrote:
>>>>>> Hi Jens,
>>>>>>
>>>>>> with Linux v5.7 final I switched to linux-block.git/for-next and reverted...
>>>>>>
>>>>>> "block: read-ahead submission should imply no-wait as well"
>>>>>>
>>>>>> ...and see no boot-slowdowns.
>>>>>
>>>>> Can you try with these patches applied instead? Or pull my async-readahead
>>>>> branch from the same location.
>>>>>
>>>>
>>>> Yes, I can do that.
>>>> I pulled from linux-block.git#async-readahead and will report later.
>>>>
>>>> Any specific testing desired by you?
>>>
>>> Just do your boot timing test and see if it works, thanks.
>>
>> Actually, can you just re-test with the current async-buffered.6 branch?
>> I think the major surgery should wait for 5.9, we can do this a bit
>> easier without having to touch everything around us.
>>
> 
> With linux-block.git#async-readahead:
> 
>   mycompiler -Wp,-MD,kernel/.sys.o.d -nostdinc -isystem
> /home/dileks/src/llvm-toolchain/install/lib/clang/10.0.1rc1/include
> -I./arch/x86/include -I./arch/x86/include/generated  -I./include
> -I./arch/x86/include/uapi -I./arch/x86/include/generated/uapi
> -I./include/uapi -I./include/generated/uapi -include
> ./include/linux/kconfig.h -include ./include/linux/compiler_types.h
> -D__KERNEL__ -Qunused-arguments -Wall -Wundef
> -Werror=strict-prototypes -Wno-trigraphs -fno-strict-aliasing
> -fno-common -fshort-wchar -fno-PIE
> -Werror=implicit-function-declaration -Werror=implicit-int
> -Wno-format-security -std=gnu89 -no-integrated-as
> -Werror=unknown-warning-option -mno-sse -mno-mmx -mno-sse2 -mno-3dnow
> -mno-avx -m64 -mno-80387 -mstack-alignment=8 -mtune=generic
> -mno-red-zone -mcmodel=kernel -Wno-sign-compare
> -fno-asynchronous-unwind-tables -mretpoline-external-thunk
> -fno-delete-null-pointer-checks -Wno-address-of-packed-member -O2
> -Wframe-larger-than=2048 -fstack-protector-strong
> -Wno-format-invalid-specifier -Wno-gnu -mno-global-merge
> -Wno-unused-const-variable -g -gz=zlib -pg -mfentry -DCC_USING_FENTRY
> -Wdeclaration-after-statement -Wvla -Wno-pointer-sign
> -Wno-array-bounds -fno-strict-overflow -fno-merge-all-constants
> -fno-stack-check -Werror=date-time -Werror=incompatible-pointer-types
> -fmacro-prefix-map=./= -fcf-protection=none -Wno-initializer-overrides
> -Wno-format -Wno-sign-compare -Wno-format-zero-length
> -Wno-tautological-constant-out-of-range-compare
> -DKBUILD_MODFILE='"kernel/sys"' -DKBUILD_BASENAME='"sys"'
> -DKBUILD_MODNAME='"sys"' -c -o kernel/sys.o kernel/sys.c
> fs/9p/vfs_addr.c:112:4: error: use of undeclared identifier 'filp'
>                         filp->private_data);
>                         ^
> 1 error generated.
> make[5]: *** [scripts/Makefile.build:267: fs/9p/vfs_addr.o] Error 1
> make[4]: *** [scripts/Makefile.build:488: fs/9p] Error 2
> make[3]: *** [Makefile:1735: fs] Error 2
> make[3]: *** Waiting for unfinished jobs....
> 
> I guess block.git#async-buffered.6 needs the same revert of "block:
> read-ahead submission should imply no-wait as well".

Sorry, forgot to push out the updated version. But as per previous
email, I think that major work should wait. Just try the updated
async-buffered.6 branch instead.

-- 
Jens Axboe