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From: David Hildenbrand <david@redhat.com>
To: linux-mm@kvack.org
Cc: Dave Young <dyoung@redhat.com>,
	Andrew Morton <akpm@linux-foundation.org>,
	Baoquan He <bhe@redhat.com>,
	Hari Bathini <hbathini@linux.vnet.ibm.com>,
	"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
	Marc-Andre Lureau <marcandre.lureau@redhat.com>,
	linux-kernel@vger.kernel.org,
	David Hildenbrand <david@redhat.com>
Subject: [PATCH RFC 4/8] kdump: expose PG_offline
Date: Fri, 13 Apr 2018 15:31:51 +0200	[thread overview]
Message-ID: <20180413133151.3199-1-david@redhat.com> (raw)
In-Reply-To: <20180413131632.1413-1-david@redhat.com>

This allows user space to skip pages that are offline when dumping. This is
especially relevant when dealing with pages that have been unplugged in
the context of virtualization, and their backing storage has already
been freed.

Signed-off-by: David Hildenbrand <david@redhat.com>
---
 kernel/crash_core.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/kernel/crash_core.c b/kernel/crash_core.c
index a93590cdd9e1..d6f21b19aeb3 100644
--- a/kernel/crash_core.c
+++ b/kernel/crash_core.c
@@ -463,6 +463,9 @@ static int __init crash_save_vmcoreinfo_init(void)
 #ifdef CONFIG_HUGETLB_PAGE
 	VMCOREINFO_NUMBER(HUGETLB_PAGE_DTOR);
 #endif
+#ifdef CONFIG_MEMORY_HOTPLUG
+	VMCOREINFO_NUMBER(PG_offline);
+#endif
 
 	arch_crash_save_vmcoreinfo();
 	update_vmcoreinfo_note();
-- 
2.14.3

  parent reply	other threads:[~2018-04-13 13:31 UTC|newest]

Thread overview: 23+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
     [not found] <20180413131632.1413-1-david@redhat.com>
2018-04-13 13:16 ` [PATCH RFC 1/8] mm/memory_hotplug: Revert "mm/memory_hotplug: optimize memory hotplug" David Hildenbrand
2018-04-13 13:16 ` [PATCH RFC 2/8] mm: introduce PG_offline David Hildenbrand
2018-04-13 13:40   ` Michal Hocko
2018-04-13 13:46     ` David Hildenbrand
2018-04-17 11:50     ` David Hildenbrand
2018-04-13 17:11   ` Matthew Wilcox
2018-04-16  8:31     ` David Hildenbrand
2018-04-21 16:52     ` Vlastimil Babka
2018-04-22  3:01       ` Matthew Wilcox
2018-04-22  8:17         ` David Hildenbrand
2018-04-22 14:02           ` Matthew Wilcox
2018-04-22 15:13             ` David Hildenbrand
2018-04-29 21:08               ` Michal Hocko
2018-04-30  6:31                 ` David Hildenbrand
2018-04-20  7:30   ` David Hildenbrand
2018-04-13 13:16 ` [PATCH RFC 3/8] mm: use PG_offline in online/offlining code David Hildenbrand
2018-04-13 13:31 ` David Hildenbrand [this message]
2018-04-13 13:33 ` [PATCH RFC 5/8] mm: only mark section offline when all pages are offline David Hildenbrand
2018-04-13 13:33 ` [PATCH RFC 6/8] mm: offline_pages() is also limited by MAX_ORDER David Hildenbrand
2018-04-13 13:33 ` [PATCH RFC 7/8] mm: allow to control onlining/offlining of memory by a driver David Hildenbrand
2018-04-13 15:59   ` Michal Hocko
2018-04-13 16:32     ` David Hildenbrand
2018-04-13 13:33 ` [PATCH RFC 8/8] mm: export more functions used to online/offline memory David Hildenbrand

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