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dmarc=none (p=none,has-list-id=yes,d=none) header.from=networkplumber.org; iprev=pass policy.iprev=140.211.166.133 (smtp2.osuosl.org); spf=pass smtp.mailfrom=driverdev-devel-bounces@linuxdriverproject.org smtp.helo=hemlock.osuosl.org; x-aligned-from=fail; x-cm=discussion score=0; x-google-dkim=fail (message has been altered, 2048-bit rsa key) header.d=1e100.net header.i=@1e100.net header.b=lmLZrS7s; x-ptr=fail x-ptr-helo=hemlock.osuosl.org x-ptr-lookup=smtp2.osuosl.org; x-return-mx=pass smtp.domain=linuxdriverproject.org smtp.result=pass smtp_is_org_domain=yes header.domain=networkplumber.org header.result=pass header_is_org_domain=yes; x-tls=pass version=TLSv1.2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128; x-vs=clean score=-100 state=0 X-ME-VSCategory: clean X-CM-Envelope: MS4wfOr2BdgY8s1FxJ6p7DKHwWTIBvsIwZrZRS54yIrn6niQDtUILcJDWQW/mBWefykQlKokclL2PlgOCgx717jNxE3GuMDtygzIZy2pU4lizn6EXCQ+mMHq GaeW7xDWQH7waAxlWJKmtn0twG27rmbYwn/TkJgqSo+QDPUYfWf3TrehZ7LLr4RMu0JmvaJYrlD1TUvOkp+16UxxMxeLESuU0yf9WsLxMRFDu5W8f52ZfVQu BRYxFckBYv/WQqrNuTfcvw== X-CM-Analysis: v=2.3 cv=WaUilXpX c=1 sm=1 tr=0 a=kIo7DnY5WRu98hpln7do/g==:117 a=kIo7DnY5WRu98hpln7do/g==:17 a=kj9zAlcOel0A:10 a=Kd1tUaAdevIA:10 a=-uNXE31MpBQA:10 a=jJxKW8Ag-pUA:10 a=Odnh0R2cAAAA:8 a=yMhMjlubAAAA:8 a=DDOyTI_5AAAA:8 a=t2t0aVZkuDpWksqkN2gA:9 a=CjuIK1q_8ugA:10 a=lNAA6UHySJB7qmBR1x20:22 a=_BcfOz0m4U4ohdxiHPKc:22 cc=dsc X-ME-CMScore: 0 X-ME-CMCategory: discussion X-Remote-Delivered-To: driverdev-devel@osuosl.org X-Google-Smtp-Source: AIpwx4/cXbXCHcZY9XYFZ3qmOLbSZJj0FmZv+DSibJEtmF9kw0ha68Mi+W/tPubQL8u4XousOHKaug== Date: Fri, 20 Apr 2018 08:50:43 -0700 From: Stephen Hemminger To: Long Li Subject: Re: [Patch v2] Storvsc: Select channel based on available percentage of ring buffer to write Message-ID: <20180420085043.3a678b89@xeon-e3> In-Reply-To: <20180419215424.3557-1-longli@linuxonhyperv.com> References: <20180419215424.3557-1-longli@linuxonhyperv.com> MIME-Version: 1.0 X-BeenThere: driverdev-devel@linuxdriverproject.org X-Mailman-Version: 2.1.24 List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stephen Hemminger , linux-scsi@vger.kernel.org, "Martin K . Petersen" , "James E . J . Bottomley" , linux-kernel@vger.kernel.org, devel@linuxdriverproject.org, Haiyang Zhang Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Errors-To: driverdev-devel-bounces@linuxdriverproject.org Sender: "devel" X-getmail-retrieved-from-mailbox: INBOX X-Mailing-List: linux-kernel@vger.kernel.org List-ID: On Thu, 19 Apr 2018 14:54:24 -0700 Long Li wrote: > From: Long Li > > This is a best effort for estimating on how busy the ring buffer is for > that channel, based on available buffer to write in percentage. It is still > possible that at the time of actual ring buffer write, the space may not be > available due to other processes may be writing at the time. > > Selecting a channel based on how full it is can reduce the possibility that > a ring buffer write will fail, and avoid the situation a channel is over > busy. > > Now it's possible that storvsc can use a smaller ring buffer size > (e.g. 40k bytes) to take advantage of cache locality. > > Changes. > v2: Pre-allocate struct cpumask on the heap. > Struct cpumask is a big structure (1k bytes) when CONFIG_NR_CPUS=8192 (default > value when CONFIG_MAXSMP=y). Don't use kernel stack for it by pre-allocating > them using kmalloc when channels are first initialized. > > Signed-off-by: Long Li Reviewed-by: Stephen Hemminger _______________________________________________ devel mailing list devel@linuxdriverproject.org http://driverdev.linuxdriverproject.org/mailman/listinfo/driverdev-devel