From: Michal Hocko <mhocko@kernel.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org, Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>, Andrea Arcangeli <aarcange@redhat.com>, Jerome Glisse <jglisse@redhat.com>, Reza Arbab <arbab@linux.vnet.ibm.com>, Yasuaki Ishimatsu <yasu.isimatu@gmail.com>, qiuxishi@huawei.com, Kani Toshimitsu <toshi.kani@hpe.com>, slaoub@gmail.com, Joonsoo Kim <js1304@gmail.com>, Andi Kleen <ak@linux.intel.com>, David Rientjes <rientjes@google.com>, Daniel Kiper <daniel.kiper@oracle.com>, Igor Mammedov <imammedo@redhat.com>, Vitaly Kuznetsov <vkuznets@redhat.com>, LKML <linux-kernel@vger.kernel.org>, Michal Hocko <mhocko@suse.com> Subject: [PATCH 06/14] mm, memory_hotplug: consider offline memblocks removable Date: Mon, 15 May 2017 10:58:19 +0200 [thread overview] Message-ID: <20170515085827.16474-7-mhocko@kernel.org> (raw) In-Reply-To: <20170515085827.16474-1-mhocko@kernel.org> From: Michal Hocko <mhocko@suse.com> is_pageblock_removable_nolock relies on having zone association to examine all the page blocks to check whether they are movable or free. This is just wasting of cycles when the memblock is offline. Later patch in the series will also change the time when the page is associated with a zone so we let's bail out early if the memblock is offline. Reported-by: Igor Mammedov <imammedo@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Michal Hocko <mhocko@suse.com> --- drivers/base/memory.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index f8fd562c3f18..1e884d82af6f 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -128,6 +128,9 @@ static ssize_t show_mem_removable(struct device *dev, int ret = 1; struct memory_block *mem = to_memory_block(dev); + if (mem->state != MEM_ONLINE) + goto out; + for (i = 0; i < sections_per_block; i++) { if (!present_section_nr(mem->start_section_nr + i)) continue; @@ -135,6 +138,7 @@ static ssize_t show_mem_removable(struct device *dev, ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION); } +out: return sprintf(buf, "%d\n", ret); } -- 2.11.0
WARNING: multiple messages have this Message-ID (diff)
From: Michal Hocko <mhocko@kernel.org> To: Andrew Morton <akpm@linux-foundation.org> Cc: linux-mm@kvack.org, Mel Gorman <mgorman@suse.de>, Vlastimil Babka <vbabka@suse.cz>, Andrea Arcangeli <aarcange@redhat.com>, Jerome Glisse <jglisse@redhat.com>, Reza Arbab <arbab@linux.vnet.ibm.com>, Yasuaki Ishimatsu <yasu.isimatu@gmail.com>, qiuxishi@huawei.com, Kani Toshimitsu <toshi.kani@hpe.com>, slaoub@gmail.com, Joonsoo Kim <js1304@gmail.com>, Andi Kleen <ak@linux.intel.com>, David Rientjes <rientjes@google.com>, Daniel Kiper <daniel.kiper@oracle.com>, Igor Mammedov <imammedo@redhat.com>, Vitaly Kuznetsov <vkuznets@redhat.com>, LKML <linux-kernel@vger.kernel.org>, Michal Hocko <mhocko@suse.com> Subject: [PATCH 06/14] mm, memory_hotplug: consider offline memblocks removable Date: Mon, 15 May 2017 10:58:19 +0200 [thread overview] Message-ID: <20170515085827.16474-7-mhocko@kernel.org> (raw) In-Reply-To: <20170515085827.16474-1-mhocko@kernel.org> From: Michal Hocko <mhocko@suse.com> is_pageblock_removable_nolock relies on having zone association to examine all the page blocks to check whether they are movable or free. This is just wasting of cycles when the memblock is offline. Later patch in the series will also change the time when the page is associated with a zone so we let's bail out early if the memblock is offline. Reported-by: Igor Mammedov <imammedo@redhat.com> Acked-by: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Michal Hocko <mhocko@suse.com> --- drivers/base/memory.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/base/memory.c b/drivers/base/memory.c index f8fd562c3f18..1e884d82af6f 100644 --- a/drivers/base/memory.c +++ b/drivers/base/memory.c @@ -128,6 +128,9 @@ static ssize_t show_mem_removable(struct device *dev, int ret = 1; struct memory_block *mem = to_memory_block(dev); + if (mem->state != MEM_ONLINE) + goto out; + for (i = 0; i < sections_per_block; i++) { if (!present_section_nr(mem->start_section_nr + i)) continue; @@ -135,6 +138,7 @@ static ssize_t show_mem_removable(struct device *dev, ret &= is_mem_section_removable(pfn, PAGES_PER_SECTION); } +out: return sprintf(buf, "%d\n", ret); } -- 2.11.0 -- 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:[~2017-05-15 9:00 UTC|newest] Thread overview: 74+ messages / expand[flat|nested] mbox.gz Atom feed top 2017-05-15 8:58 [PATCH -v4 0/14] mm: make movable onlining suck less Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-15 8:58 ` [PATCH 01/14] mm: remove return value from init_currently_empty_zone Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-15 8:58 ` [PATCH 02/14] mm, memory_hotplug: use node instead of zone in can_online_high_movable Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-15 8:58 ` [PATCH 03/14] mm: drop page_initialized check from get_nid_for_pfn Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-15 8:58 ` [PATCH 04/14] mm, memory_hotplug: get rid of is_zone_device_section Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-06-10 9:56 ` Wei Yang 2017-06-10 9:56 ` Wei Yang 2017-06-10 14:58 ` Wei Yang 2017-06-10 14:58 ` Wei Yang 2017-06-12 6:49 ` Michal Hocko 2017-06-12 6:49 ` Michal Hocko 2017-06-14 6:17 ` Wei Yang 2017-06-14 6:12 ` Wei Yang 2017-06-14 6:32 ` Michal Hocko 2017-06-14 6:32 ` Michal Hocko 2017-06-14 9:12 ` Wei Yang 2017-06-14 9:24 ` Michal Hocko 2017-06-14 9:24 ` Michal Hocko 2017-06-15 1:02 ` Wei Yang 2017-05-15 8:58 ` [PATCH 05/14] mm, memory_hotplug: split up register_one_node Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-15 8:58 ` Michal Hocko [this message] 2017-05-15 8:58 ` [PATCH 06/14] mm, memory_hotplug: consider offline memblocks removable Michal Hocko 2017-05-15 8:58 ` [PATCH 07/14] mm: consider zone which is not fully populated to have holes Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-18 16:14 ` Vlastimil Babka 2017-05-18 16:14 ` Vlastimil Babka 2017-05-18 16:42 ` Michal Hocko 2017-05-18 16:42 ` Michal Hocko 2017-05-19 7:21 ` Vlastimil Babka 2017-05-19 7:21 ` Vlastimil Babka 2017-05-15 8:58 ` [PATCH 08/14] mm, compaction: skip over holes in __reset_isolation_suitable Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-19 7:23 ` Vlastimil Babka 2017-05-19 7:23 ` Vlastimil Babka 2017-05-15 8:58 ` [PATCH 09/14] mm: __first_valid_page skip over offline pages Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-19 8:05 ` Vlastimil Babka 2017-05-19 8:05 ` Vlastimil Babka 2017-05-15 8:58 ` [PATCH 10/14] mm, vmstat: skip reporting offline pages in pagetypeinfo Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-19 8:17 ` Vlastimil Babka 2017-05-19 8:17 ` Vlastimil Babka 2017-05-15 8:58 ` [PATCH 11/14] mm, memory_hotplug: do not associate hotadded memory to zones until online Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-19 8:56 ` Vlastimil Babka 2017-05-19 8:56 ` Vlastimil Babka 2017-06-16 4:20 ` Wei Yang 2017-06-16 8:05 ` Michal Hocko 2017-06-16 8:05 ` Michal Hocko 2017-06-16 8:11 ` Wei Yang 2017-06-16 8:45 ` Michal Hocko 2017-06-16 8:45 ` Michal Hocko 2017-06-16 9:11 ` Wei Yang 2017-06-25 0:14 ` Wei Yang 2017-06-26 5:38 ` Michal Hocko 2017-06-26 5:38 ` Michal Hocko 2017-05-15 8:58 ` [PATCH 12/14] mm, memory_hotplug: replace for_device by want_memblock in arch_add_memory Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-15 8:58 ` [PATCH 13/14] mm, memory_hotplug: fix the section mismatch warning Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-05-15 8:58 ` [PATCH 14/14] mm, memory_hotplug: remove unused cruft after memory hotplug rework Michal Hocko 2017-05-15 8:58 ` Michal Hocko 2017-06-09 9:51 ` [PATCH -v4 0/14] mm: make movable onlining suck less Wei Yang 2017-06-09 9:51 ` Wei Yang 2017-06-09 10:49 ` Michal Hocko 2017-06-09 10:49 ` Michal Hocko 2017-06-10 2:20 ` Wei Yang 2017-06-10 2:20 ` Wei Yang
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