From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from out-187.mta1.migadu.com (out-187.mta1.migadu.com [95.215.58.187]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CCDEA59154 for ; Wed, 15 May 2024 10:25:27 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=95.215.58.187 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715768729; cv=none; b=UzcL+UB6uzZoQ4y+6gkyO1KW5sDVAPqY+DNxJHwaesytt+dfXjeU8udD95mIo7B+4kTccDKaFzwoZbO9WDJImiCprDb4pEWtnaiKzOACfx1+XRfGEg3V6Sn5o1/9btGbZcW8eC68aWjUNLCNBfeRZfvqlICjPFcuJbqtvdQej/o= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1715768729; c=relaxed/simple; bh=61QtqgUIYCUvKNCI+i+FK7j9DN9tTUJuVCmvvB+wl0o=; h=Message-ID:Date:MIME-Version:Subject:To:Cc:References:From: In-Reply-To:Content-Type; b=lf4AZKNxvdJwXocInrsspDFtaoGbtJLUMKZ7iLhA4uJXbt5+OM8px00Uq7HNY/eXi+yN232DWxUbBUZUsP2ivZIr//jKpyrC7b814xHsOxHVYykeo7II5l/2z/51ksz6RF5/w3M73Un2/gJ08KjbXvRWziuJDU7BAb1+Ps9SFlE= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev; spf=pass smtp.mailfrom=linux.dev; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b=NolITH8Z; arc=none smtp.client-ip=95.215.58.187 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.dev Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.dev Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.dev header.i=@linux.dev header.b="NolITH8Z" Message-ID: DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1715768725; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version:content-type:content-type: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=P/ZZaTU0/VgSxc2Swak4to3Vh7ELEAoB1SsmiSVOm8U=; b=NolITH8ZNoY3Gtu86EEP0rWNCiI7AbYH5k0yC7AQhTLzSnLHEWl4v48iff5ov9FFF6wixB 3GAnpsPDS7V8FkhIQOmxe+9W3AhDphpPT17EPiljp0yhulfkkRe3NopZdXGAIaH8eovB+z tJQZNX1V8m3oLCIhVhK3qUWTJi9U8RY= Date: Wed, 15 May 2024 12:25:22 +0200 Precedence: bulk X-Mailing-List: netdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Subject: Re: [PATCH 0/6] rds: rdma: Add ability to force GFP_NOIO To: Haakon Bugge , Zhu Yanjun Cc: OFED mailing list , open list , netdev , "rds-devel@oss.oracle.com" , Jason Gunthorpe , Leon Romanovsky , Saeed Mahameed , Tariq Toukan , "David S . Miller" , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Tejun Heo , Lai Jiangshan , Allison Henderson , Manjunath Patil , Mark Zhang , Chuck Lever III , Shiraz Saleem , Yang Li References: <20240513125346.764076-1-haakon.bugge@oracle.com> <38a5ccc6-d0bc-41e0-99de-fe7902b1951f@linux.dev> <54d14e4e-63e7-4bce-866f-0e2f2c801232@gmail.com> <8F5C99B3-2575-482C-B931-7510CCF55B03@oracle.com> X-Report-Abuse: Please report any abuse attempt to abuse@migadu.com and include these headers. From: Zhu Yanjun In-Reply-To: <8F5C99B3-2575-482C-B931-7510CCF55B03@oracle.com> Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT 在 2024/5/14 20:32, Haakon Bugge 写道: > Hi Yanjun, > > >> On 14 May 2024, at 14:02, Zhu Yanjun wrote: >> >> >> >> On 14.05.24 10:53, Zhu Yanjun wrote: >>> On 13.05.24 14:53, Håkon Bugge wrote: >>>> This series enables RDS and the RDMA stack to be used as a block I/O >>>> device. This to support a filesystem on top of a raw block device >>> This is to support a filesystem ... ? >> >> Sorry. my bad. I mean, normally rds is used to act as a communication protocol between Oracle databases. Now in this patch series, it seems that rds acts as a communication protocol to support a filesystem. So I am curious which filesystem that rds is supporting? > > The peer here is a file-server which acts a block device. What Oracle calls a cell-server. The initiator here, is actually using XFS over an Oracle in-kernel pseudo-volume block device. Thanks Haakon. There is a link about GFP_NOFS and GFP_NOIO, https://lore.kernel.org/linux-fsdevel/ZZcgXI46AinlcBDP@casper.infradead.org/. I am not sure if you have read this link or not. In this link, the writer has his ideas about GFP_NOFS and GFP_NOIO. " My interest in this is that I'd like to get rid of the FGP_NOFS flag. It'd also be good to get rid of the __GFP_FS flag since there's always demand for more GFP flags. I have a git branch with some work in this area, so there's a certain amount of conference-driven development going on here too. We could mutatis mutandi for GFP_NOIO, memalloc_noio_save/restore, __GFP_IO, etc, so maybe the block people are also interested. I haven't looked into that in any detail though. I guess we'll see what interest this topic gains. " Anyway, good luck! Zhu Yanjun > > > Thxs, Håkon >