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([2605:e000:100e:8c61:4922:2226:8cd7:a61e]) by smtp.gmail.com with ESMTPSA id h4sm489517pfo.3.2020.05.26.15.59.24 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Tue, 26 May 2020 15:59:24 -0700 (PDT) Subject: Re: [PATCH v2 0/4] io_uring: call statx directly To: Bijan Mottahedeh Cc: io-uring@vger.kernel.org, linux-fsdevel@vger.kernel.org References: <1590208279-33811-1-git-send-email-bijan.mottahedeh@oracle.com> From: Jens Axboe Message-ID: Date: Tue, 26 May 2020 16:59:23 -0600 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <1590208279-33811-1-git-send-email-bijan.mottahedeh@oracle.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-fsdevel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-fsdevel@vger.kernel.org On 5/22/20 10:31 PM, Bijan Mottahedeh wrote: > v1 -> v2 > > - Separate statx and open in io_kiocb > - Remove external declarations for unused statx interfaces > > This patch set is a fix for the liburing statx test failure. > > The test fails with a "Miscompare between io_uring and statx" error > because the statx system call path has additional processing in vfs_statx(): > > stat->result_mask |= STATX_MNT_ID; > if (path.mnt->mnt_root == path.dentry) > stat->attributes |= STATX_ATTR_MOUNT_ROOT; > stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT; > > which then results in different result_mask values. > > Allowing the system call to be invoked directly simplifies the io_uring > interface and avoids potential future incompatibilities. I'm not sure > if there was other reasoning fort not doing so initially. > > One issue I cannot account for is the difference in "used" memory reported > by free(1) after running the statx a large (10000) number of times. > > The difference is significant ~100k and doesn't really change after > dropping caches. > > I enabled memory leak detection and couldn't see anything related to the test. > > Bijan Mottahedeh (4): > io_uring: add io_statx structure > statx: allow system call to be invoked from io_uring > io_uring: call statx directly > statx: hide interfaces no longer used by io_uring > > fs/internal.h | 4 ++-- > fs/io_uring.c | 72 +++++++++++++++-------------------------------------------- > fs/stat.c | 37 +++++++++++++++++------------- > 3 files changed, 42 insertions(+), 71 deletions(-) Thanks, this looks better. For a bit of history, the initial attempt was to do the statx without async offload if we could do so without blocking. Without that, we may as well simplify it. -- Jens Axboe