From: Xishi Qiu <qiuxishi@huawei.com> To: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: David Rientjes <rientjes@google.com>, Andrew Morton <akpm@linux-foundation.org>, Vlastimil Babka <vbabka@suse.cz>, "Naoya Horiguchi" <n-horiguchi@ah.jp.nec.com>, Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 1/2] mem-hotplug: use GFP_HIGHUSER_MOVABLE in, alloc_migrate_target() Date: Mon, 18 Jul 2016 16:00:10 +0800 [thread overview] Message-ID: <578C8C8A.8000007@huawei.com> (raw) In-Reply-To: <20160718055150.GF9460@js1304-P5Q-DELUXE> On 2016/7/18 13:51, Joonsoo Kim wrote: > On Fri, Jul 15, 2016 at 10:47:06AM +0800, Xishi Qiu wrote: >> alloc_migrate_target() is called from migrate_pages(), and the page >> is always from user space, so we can add __GFP_HIGHMEM directly. > > No, all migratable pages are not from user space. For example, > blockdev file cache has __GFP_MOVABLE and migratable but it has no > __GFP_HIGHMEM and __GFP_USER. > Hi Joonsoo, So the original code "gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE;" is not correct? > And, zram's memory isn't GFP_HIGHUSER_MOVABLE but has __GFP_MOVABLE. > Can we distinguish __GFP_MOVABLE or GFP_HIGHUSER_MOVABLE when doing mem-hotplug? Thanks, Xishi Qiu > Thanks. > > > . >
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From: Xishi Qiu <qiuxishi@huawei.com> To: Joonsoo Kim <iamjoonsoo.kim@lge.com> Cc: David Rientjes <rientjes@google.com>, Andrew Morton <akpm@linux-foundation.org>, Vlastimil Babka <vbabka@suse.cz>, Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>, Linux MM <linux-mm@kvack.org>, LKML <linux-kernel@vger.kernel.org> Subject: Re: [PATCH 1/2] mem-hotplug: use GFP_HIGHUSER_MOVABLE in, alloc_migrate_target() Date: Mon, 18 Jul 2016 16:00:10 +0800 [thread overview] Message-ID: <578C8C8A.8000007@huawei.com> (raw) In-Reply-To: <20160718055150.GF9460@js1304-P5Q-DELUXE> On 2016/7/18 13:51, Joonsoo Kim wrote: > On Fri, Jul 15, 2016 at 10:47:06AM +0800, Xishi Qiu wrote: >> alloc_migrate_target() is called from migrate_pages(), and the page >> is always from user space, so we can add __GFP_HIGHMEM directly. > > No, all migratable pages are not from user space. For example, > blockdev file cache has __GFP_MOVABLE and migratable but it has no > __GFP_HIGHMEM and __GFP_USER. > Hi Joonsoo, So the original code "gfp_t gfp_mask = GFP_USER | __GFP_MOVABLE;" is not correct? > And, zram's memory isn't GFP_HIGHUSER_MOVABLE but has __GFP_MOVABLE. > Can we distinguish __GFP_MOVABLE or GFP_HIGHUSER_MOVABLE when doing mem-hotplug? Thanks, Xishi Qiu > Thanks. > > > . > -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@kvack.org"> email@kvack.org </a>
next prev parent reply other threads:[~2016-07-18 8:01 UTC|newest] Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-07-15 2:47 [PATCH 1/2] mem-hotplug: use GFP_HIGHUSER_MOVABLE in, alloc_migrate_target() Xishi Qiu 2016-07-15 2:47 ` Xishi Qiu 2016-07-15 2:51 ` [PATCH 2/2] mem-hotplug: use different mempolicy in alloc_migrate_target() Xishi Qiu 2016-07-15 2:51 ` Xishi Qiu 2016-07-18 8:00 ` Vlastimil Babka 2016-07-18 8:00 ` Vlastimil Babka 2016-07-18 5:51 ` [PATCH 1/2] mem-hotplug: use GFP_HIGHUSER_MOVABLE in, alloc_migrate_target() Joonsoo Kim 2016-07-18 5:51 ` Joonsoo Kim 2016-07-18 7:45 ` Vlastimil Babka 2016-07-18 7:45 ` Vlastimil Babka 2016-07-18 8:00 ` Xishi Qiu [this message] 2016-07-18 8:00 ` Xishi Qiu 2016-07-18 8:05 ` Vlastimil Babka 2016-07-18 8:05 ` Vlastimil Babka 2016-07-18 8:31 ` Xishi Qiu 2016-07-18 8:31 ` Xishi Qiu 2016-07-19 6:50 ` Joonsoo Kim 2016-07-19 6:50 ` Joonsoo Kim 2016-07-19 7:18 ` Xishi Qiu 2016-07-19 7:18 ` Xishi Qiu 2016-07-19 19:05 ` David Rientjes 2016-07-19 19:05 ` David Rientjes
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