From: Christoph Hellwig <hch-jcswGhMUV9g@public.gmane.org>
To: Huaisheng HS1 Ye <yehs1-6jq1YtArVR3QT0dZR+AlfA@public.gmane.org>
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Subject: Re: [External] Re: [RFC PATCH v2 00/12] get rid of GFP_ZONE_TABLE/BAD
Date: Wed, 30 May 2018 11:11:19 +0200 [thread overview]
Message-ID: <20180530091119.GA30154@lst.de> (raw)
In-Reply-To: <HK2PR03MB1684C44F2408F3927B1A21BC926C0-LG58XzHXFHAzM6+avpAIg682SN/2zMuYvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
On Wed, May 30, 2018 at 09:02:13AM +0000, Huaisheng HS1 Ye wrote:
>
> I don't quite understand that. I think those, mostly drivers, need to
> get the correct zone they want. ZONE_DMA32 is an example, if drivers can be
> satisfied with a low mem zone, why they mark the gfp flags as
> 'GFP_KERNEL|__GFP_DMA32'?
Drivers should never use GFP_DMA32 directly. The right abstraction is
the DMA API, ZONE_DMA32 is just a helper.
WARNING: multiple messages have this Message-ID (diff)
From: Christoph Hellwig <hch@lst.de>
To: Huaisheng HS1 Ye <yehs1@lenovo.com>
Cc: Michal Hocko <mhocko@kernel.org>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"willy@infradead.org" <willy@infradead.org>,
"vbabka@suse.cz" <vbabka@suse.cz>,
"mgorman@techsingularity.net" <mgorman@techsingularity.net>,
"kstewart@linuxfoundation.org" <kstewart@linuxfoundation.org>,
"alexander.levin@verizon.com" <alexander.levin@verizon.com>,
"gregkh@linuxfoundation.org" <gregkh@linuxfoundation.org>,
"colyli@suse.de" <colyli@suse.de>,
NingTing Cheng <chengnt@lenovo.com>,
Ocean HY1 He <hehy1@lenovo.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"iommu@lists.linux-foundation.org"
<iommu@lists.linux-foundation.org>,
"xen-devel@lists.xenproject.org" <xen-devel@lists.xenproject.org>,
"linux-btrfs@vger.kernel.org" <linux-btrfs@vger.kernel.org>,
Christoph Hellwig <hch@lst.de>
Subject: Re: [External] Re: [RFC PATCH v2 00/12] get rid of GFP_ZONE_TABLE/BAD
Date: Wed, 30 May 2018 11:11:19 +0200 [thread overview]
Message-ID: <20180530091119.GA30154@lst.de> (raw)
In-Reply-To: <HK2PR03MB1684C44F2408F3927B1A21BC926C0@HK2PR03MB1684.apcprd03.prod.outlook.com>
On Wed, May 30, 2018 at 09:02:13AM +0000, Huaisheng HS1 Ye wrote:
>
> I don't quite understand that. I think those, mostly drivers, need to
> get the correct zone they want. ZONE_DMA32 is an example, if drivers can be
> satisfied with a low mem zone, why they mark the gfp flags as
> 'GFP_KERNEL|__GFP_DMA32'?
Drivers should never use GFP_DMA32 directly. The right abstraction is
the DMA API, ZONE_DMA32 is just a helper.
next prev parent reply other threads:[~2018-05-30 9:11 UTC|newest]
Thread overview: 72+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-21 15:20 [RFC PATCH v2 00/12] get rid of GFP_ZONE_TABLE/BAD Huaisheng Ye
2018-05-21 15:20 ` [RFC PATCH v2 01/12] include/linux/gfp.h: " Huaisheng Ye
2018-05-21 15:20 ` Huaisheng Ye
2018-05-21 15:20 ` [RFC PATCH v2 02/12] arch/x86/kernel/amd_gart_64: update usage of address zone modifiers Huaisheng Ye
[not found] ` <1526916033-4877-3-git-send-email-yehs2007-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-05-22 9:38 ` Christoph Hellwig
2018-05-22 9:38 ` Christoph Hellwig
2018-05-22 10:17 ` [External] " Huaisheng HS1 Ye
[not found] ` <20180522093806.GA25671-wEGCiKHe2LqWVfeAwA7xHQ@public.gmane.org>
2018-05-22 10:17 ` Huaisheng HS1 Ye
2018-05-22 10:17 ` Huaisheng HS1 Ye
2018-05-22 9:38 ` Christoph Hellwig
2018-05-21 15:20 ` Huaisheng Ye
2018-05-21 15:20 ` [RFC PATCH v2 03/12] arch/x86/kernel/pci-calgary_64: " Huaisheng Ye
2018-05-21 15:20 ` Huaisheng Ye
2018-05-21 15:20 ` [RFC PATCH v2 04/12] drivers/iommu/amd_iommu: " Huaisheng Ye
2018-05-21 15:20 ` Huaisheng Ye
2018-05-21 15:20 ` [RFC PATCH v2 05/12] include/linux/dma-mapping: " Huaisheng Ye
2018-05-21 15:20 ` Huaisheng Ye
[not found] ` <1526916033-4877-6-git-send-email-yehs2007-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-05-21 15:30 ` Christoph Hellwig
2018-05-21 15:30 ` Christoph Hellwig
2018-05-21 15:30 ` Christoph Hellwig
2018-05-21 15:20 ` [RFC PATCH v2 10/12] mm/zsmalloc: " Huaisheng Ye
[not found] ` <1526916033-4877-11-git-send-email-yehs2007-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-05-22 11:22 ` Matthew Wilcox
2018-05-22 11:22 ` Matthew Wilcox
2018-05-22 11:51 ` [External] " Huaisheng HS1 Ye
[not found] ` <20180522112230.GA5412-PfSpb0PWhxZc2C7mugBRk2EX/6BAtgUQ@public.gmane.org>
2018-05-22 11:51 ` Huaisheng HS1 Ye
2018-05-22 11:51 ` Huaisheng HS1 Ye
2018-05-22 11:22 ` Matthew Wilcox
2018-05-21 15:20 ` Huaisheng Ye
2018-05-21 15:20 ` [RFC PATCH v2 11/12] include/linux/highmem: update usage of movableflags Huaisheng Ye
2018-05-21 15:20 ` Huaisheng Ye
2018-05-21 15:20 ` [RFC PATCH v2 12/12] arch/x86/include/asm/page.h: " Huaisheng Ye
2018-05-21 15:20 ` Huaisheng Ye
[not found] ` <1526916033-4877-1-git-send-email-yehs2007-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
2018-05-22 9:40 ` [RFC PATCH v2 00/12] get rid of GFP_ZONE_TABLE/BAD Christoph Hellwig
2018-05-22 9:40 ` Christoph Hellwig
2018-05-22 9:40 ` Christoph Hellwig
2018-05-22 18:37 ` Michal Hocko
2018-05-22 18:37 ` Michal Hocko
2018-05-23 16:07 ` [External] " Huaisheng HS1 Ye
[not found] ` <20180522183728.GB20441-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2018-05-23 16:07 ` Huaisheng HS1 Ye
2018-05-23 16:07 ` Huaisheng HS1 Ye
2018-05-24 12:18 ` Michal Hocko
2018-05-24 12:18 ` Michal Hocko
2018-05-24 12:18 ` Michal Hocko
[not found] ` <20180524121853.GG20441-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2018-05-25 9:43 ` Huaisheng HS1 Ye
2018-05-25 9:43 ` Huaisheng HS1 Ye
[not found] ` <HK2PR03MB1684ED6EC6859A88A196DC0C92690-LG58XzHXFHAzM6+avpAIg682SN/2zMuYvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2018-05-28 13:37 ` Michal Hocko
2018-05-28 13:37 ` Michal Hocko
[not found] ` <20180528133733.GF27180-2MMpYkNvuYDjFM9bn6wA6Q@public.gmane.org>
2018-05-30 9:02 ` Huaisheng HS1 Ye
2018-05-30 9:02 ` Huaisheng HS1 Ye
2018-05-30 9:11 ` Christoph Hellwig
[not found] ` <HK2PR03MB1684C44F2408F3927B1A21BC926C0-LG58XzHXFHAzM6+avpAIg682SN/2zMuYvxpqHgZTriW3zl9H0oFU5g@public.gmane.org>
2018-05-30 9:11 ` Christoph Hellwig [this message]
2018-05-30 9:11 ` Christoph Hellwig
2018-05-30 9:12 ` Michal Hocko
2018-05-30 9:12 ` Michal Hocko
2018-05-30 9:12 ` Michal Hocko
2018-05-30 9:02 ` Huaisheng HS1 Ye
2018-05-28 13:37 ` Michal Hocko
2018-05-25 9:43 ` Huaisheng HS1 Ye
2018-05-24 5:19 ` Matthew Wilcox
2018-05-24 5:19 ` Matthew Wilcox
2018-05-24 12:23 ` Michal Hocko
[not found] ` <20180524051919.GA9819-PfSpb0PWhxZc2C7mugBRk2EX/6BAtgUQ@public.gmane.org>
2018-05-24 12:23 ` Michal Hocko
2018-05-24 12:23 ` Michal Hocko
2018-05-24 15:18 ` Matthew Wilcox
2018-05-24 15:29 ` Michal Hocko
2018-05-25 12:00 ` Matthew Wilcox
2018-05-28 13:33 ` Michal Hocko
2018-05-28 13:33 ` Michal Hocko
2018-05-25 12:00 ` Matthew Wilcox
2018-05-24 15:29 ` Michal Hocko
2018-05-24 15:18 ` Matthew Wilcox
2018-05-24 5:19 ` Matthew Wilcox
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