From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (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 8275C13DBA2 for ; Tue, 9 Jul 2024 07:35:56 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=198.137.202.133 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720510557; cv=none; b=dd3r6nwNa/S7ukbuEpwo+vLFcxhbkNm+0V1hQh+vkUWZ3lfV4hbvI9qVp6xibJAQ48a7IgKFHXzU8DTACsAXu4P0BK2/a/1pcICwpNBI/t86En3WQjeAJ2Pywq5rydAxQ6ejsyMMOR8+skCzFohESw9hJC4x9rxOh+DeJFIwyEc= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1720510557; c=relaxed/simple; bh=HeyJ9lMz1NSGY+tG5/lo4GiCzuIF5FSVCvTEm2YeLdY=; h=Date:From:To:Cc:Subject:Message-ID:References:MIME-Version: Content-Type:Content-Disposition:In-Reply-To; b=gqTOnY7jDTI4rN96GVvZ5sknzXFNw81l3FDKtU4ATCCp4/U5USCnIaU145rKzY2DoFa30raGJwNpS+dRPr2MEVsu+s9QzDt8sBk9SW3CQdTciMEZE7AiKVFHDaP23m8TA5JoGT9A6VF7j8UxMdlCDcnyOz5TFZmcrf+jqE4GPEA= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b=xHVX/rur; arc=none smtp.client-ip=198.137.202.133 Authentication-Results: smtp.subspace.kernel.org; dmarc=none (p=none dis=none) header.from=infradead.org Authentication-Results: smtp.subspace.kernel.org; spf=none smtp.mailfrom=bombadil.srs.infradead.org Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=infradead.org header.i=@infradead.org header.b="xHVX/rur" DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=infradead.org; s=bombadil.20210309; h=In-Reply-To:Content-Type:MIME-Version :References:Message-ID:Subject:Cc:To:From:Date:Sender:Reply-To: Content-Transfer-Encoding:Content-ID:Content-Description; bh=gbMJt7ebPejehgKgh9FlmEO1SVbhJB/ogMBBrAQcifk=; b=xHVX/rur1eoKdfYrI4y6Z9fVRX DkNTM9YhfDTDhcoL+n+awFBX+0D0/UQSnx9hb01aogrqPU46b6aAtKcaPk5d1bbbm1MiVprQS0QO/ xRCZBqNTCPvlgloOVC8uokEMWDWz22FQah/wuHE+7H2WyfZy2pDYRFLt7ICwgd0HZnGgS+Cq/3kU5 xHqMsSmVXI5qi5IJ+GNDQRvrLXcEDskPaaUVtvdKhgP+jYqK+SgCcffIAUisLgzJo1hdTlkwDKwwW zTqjli6QFmSaomEk1DvtnTd/zA74BM6sjYkdIrsRM+CTdQ7YF1sKcRCrGcaxLnF9OFIGwVPAKQVAq p8tlhfaQ==; Received: from hch by bombadil.infradead.org with local (Exim 4.97.1 #2 (Red Hat Linux)) id 1sR5OF-00000006Fey-3a2X; Tue, 09 Jul 2024 07:35:55 +0000 Date: Tue, 9 Jul 2024 00:35:55 -0700 From: Christoph Hellwig To: Yee Li Cc: Christoph Hellwig , Dan Williams , linux-cxl@vger.kernel.org Subject: Re: Is there any plan to support CXL GPF in Linux Message-ID: References: <668c877f86daf_102cc2941b@dwillia2-xfh.jf.intel.com.notmuch> Precedence: bulk X-Mailing-List: linux-cxl@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-SRS-Rewrite: SMTP reverse-path rewritten from by bombadil.infradead.org. See http://www.infradead.org/rpr.html On Tue, Jul 09, 2024 at 03:22:53PM +0800, Yee Li wrote: > As I know, for cxl pmem, the DRAM cache is very large (even equal to > NAND flash). The data is stored in the DRAM cache. Data sync during > power loss or some sync operations. Data is stored in the DRAM cache > for most of the time. If the device can't provide enough power on it's own to take care of the DRAM flushing then it's simply broken. All these details are something the manufacturer needs to take care off.