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([2620:15c:2cd:203:5cdc:422c:7b28:ebb5]) by smtp.gmail.com with ESMTPSA id 3-v6sm52390858pga.12.2018.11.06.16.24.13 (version=TLS1_2 cipher=ECDHE-RSA-CHACHA20-POLY1305 bits=256/256); Tue, 06 Nov 2018 16:24:13 -0800 (PST) Message-ID: <1541550252.196084.200.camel@acm.org> Subject: Re: [driver-core PATCH v5 7/9] driver core: Attach devices on CPU local to device node From: Bart Van Assche To: Alexander Duyck , linux-kernel@vger.kernel.org, gregkh@linuxfoundation.org Cc: linux-nvdimm@lists.01.org, tj@kernel.org, akpm@linux-foundation.org, linux-pm@vger.kernel.org, jiangshanlai@gmail.com, rafael@kernel.org, len.brown@intel.com, pavel@ucw.cz, zwisler@kernel.org, dan.j.williams@intel.com, dave.jiang@intel.com Date: Tue, 06 Nov 2018 16:24:12 -0800 In-Reply-To: <154145233508.29224.9891071445860629874.stgit@ahduyck-desk1.jf.intel.com> References: <154145223352.29224.8912797012647157172.stgit@ahduyck-desk1.jf.intel.com> <154145233508.29224.9891071445860629874.stgit@ahduyck-desk1.jf.intel.com> Content-Type: text/plain; charset="UTF-7" X-Mailer: Evolution 3.26.2-1 Mime-Version: 1.0 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On Mon, 2018-11-05 at 13:12 -0800, Alexander Duyck wrote: +AD4 This change makes it so that we call the asynchronous probe routines on a +AD4 CPU local to the device node. By doing this we should be able to improve +AD4 our initialization time significantly as we can avoid having to access the +AD4 device from a remote node which may introduce higher latency. +AD4 +AD4 For example, in the case of initializing memory for NVDIMM this can have a +AD4 significant impact as initialing 3TB on remote node can take up to 39 +AD4 seconds while initialing it on a local node only takes 23 seconds. It is +AD4 situations like this where we will see the biggest improvement. +AD4 +AD4 Signed-off-by: Alexander Duyck +ADw-alexander.h.duyck+AEA-linux.intel.com+AD4 +AD4 --- +AD4 drivers/base/dd.c +AHw 4 +-+--- +AD4 1 file changed, 2 insertions(+-), 2 deletions(-) +AD4 +AD4 diff --git a/drivers/base/dd.c b/drivers/base/dd.c +AD4 index 2fdfe45bb6ea..cf7681309ee3 100644 +AD4 --- a/drivers/base/dd.c +AD4 +-+-+- b/drivers/base/dd.c +AD4 +AEAAQA -834,7 +-834,7 +AEAAQA static int +AF8AXw-device+AF8-attach(struct device +ACo-dev, bool allow+AF8-async) +AD4 dev+AF8-dbg(dev, +ACI-scheduling asynchronous probe+AFw-n+ACI)+ADs +AD4 get+AF8-device(dev)+ADs +AD4 dev-+AD4-async+AF8-probe +AD0 true+ADs +AD4 - async+AF8-schedule(+AF8AXw-device+AF8-attach+AF8-async+AF8-helper, dev)+ADs +AD4 +- async+AF8-schedule+AF8-dev(+AF8AXw-device+AF8-attach+AF8-async+AF8-helper, dev)+ADs +AD4 +AH0 else +AHs +AD4 pm+AF8-request+AF8-idle(dev)+ADs +AD4 +AH0 +AD4 +AEAAQA -992,7 +-992,7 +AEAAQA static int +AF8AXw-driver+AF8-attach(struct device +ACo-dev, void +ACo-data) +AD4 if (+ACE-dev-+AD4-driver) +AHs +AD4 get+AF8-device(dev)+ADs +AD4 dev+AF8-set+AF8-drv+AF8-async(dev, drv)+ADs +AD4 - async+AF8-schedule(+AF8AXw-driver+AF8-attach+AF8-async+AF8-helper, dev)+ADs +AD4 +- async+AF8-schedule+AF8-dev(+AF8AXw-driver+AF8-attach+AF8-async+AF8-helper, dev)+ADs +AD4 +AH0 +AD4 device+AF8-unlock(dev)+ADs +AD4 return 0+ADs Reviewed-by: Bart Van Assche +ADw-bvanassche+AEA-acm.org+AD4