From johan@teenageengineering.com Mon Feb 01 11:29:40 2010 Received: from n12.c03.server-system.net ([72.47.224.12]) by stoneboat.aleph1.co.uk with esmtp (Exim 4.69) (envelope-from ) id 1NbuTG-0008MH-Lu for yaffs@lists.aleph1.co.uk; Mon, 01 Feb 2010 11:29:40 +0000 Received: from [212.107.146.90] (port=46719 helo=johanxp) by n12.c03.server-system.net with esmtpa (Exim 4.63) (envelope-from ) id 1NbuT1-0003uR-VJ for yaffs@lists.aleph1.co.uk; Mon, 01 Feb 2010 03:29:21 -0800 Message-ID: From: "Johan Kotlinski" To: Date: Mon, 1 Feb 2010 12:29:17 +0100 MIME-Version: 1.0 Content-Type: multipart/alternative; boundary="----=_NextPart_000_00B2_01CAA33A.2BEFD8D0" X-Priority: 3 X-MSMail-Priority: Normal X-Mailer: Microsoft Outlook Express 6.00.2900.5843 X-MimeOLE: Produced By Microsoft MimeOLE V6.00.2900.5579 X-Authenticated-User: 48231 johan@teenageengineering.com X-SA-Exim-Connect-IP: 72.47.224.12 X-SA-Exim-Mail-From: johan@teenageengineering.com X-Spam-Checker-Version: SpamAssassin 3.2.5 (2008-06-10) on stoneboat.aleph1.co.uk X-Spam-Level: X-Spam-Status: No, score=0.0 required=4.5 tests=BAYES_50,HTML_MESSAGE autolearn=no version=3.2.5 X-SA-Exim-Version: 4.2.1 (built Wed, 25 Jun 2008 17:14:11 +0000) X-SA-Exim-Scanned: Yes (on stoneboat.aleph1.co.uk) Subject: [Yaffs] multithreading question X-BeenThere: yaffs@lists.aleph1.co.uk X-Mailman-Version: 2.1.11 Precedence: list List-Id: Discussion of YAFFS NAND flash filesystem List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , X-List-Received-Date: Mon, 01 Feb 2010 11:29:41 -0000 This is a multi-part message in MIME format. ------=_NextPart_000_00B2_01CAA33A.2BEFD8D0 Content-Type: text/plain; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable Hi! It appears that Yaffs2 multithreading protection is on a very high level = (mutex wrapping entire fread/fwrite calls). My worry is that if a low-priority task does a large fwrite call, it = could block high-priority tasks for a long time. Is this an acknowledged problem? Are there comparable file systems that = handle multithreading in a more granular way? Regards, Johan ------=_NextPart_000_00B2_01CAA33A.2BEFD8D0 Content-Type: text/html; charset="iso-8859-1" Content-Transfer-Encoding: quoted-printable
Hi!
It appears that Yaffs2 multithreading = protection is=20 on a very high level (mutex wrapping entire fread/fwrite = calls).
 
My worry is that if a low-priority task = does a=20 large fwrite call, it could block high-priority tasks for a long=20 time.
Is this an acknowledged problem? Are = there=20 comparable file systems that handle multithreading in a more granular=20 way?
 
Regards,
Johan
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