From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-ed1-f70.google.com (mail-ed1-f70.google.com [209.85.208.70]) by kanga.kvack.org (Postfix) with ESMTP id 75C4D6B0882 for ; Fri, 16 Nov 2018 03:30:39 -0500 (EST) Received: by mail-ed1-f70.google.com with SMTP id c8-v6so11064847edt.23 for ; Fri, 16 Nov 2018 00:30:39 -0800 (PST) Received: from mail-sor-f65.google.com (mail-sor-f65.google.com. [209.85.220.65]) by mx.google.com with SMTPS id n7-v6sor3126134edq.26.2018.11.16.00.30.37 for (Google Transport Security); Fri, 16 Nov 2018 00:30:37 -0800 (PST) From: Michal Hocko Subject: [PATCH 4/5] mm, memory_hotplug: print reason for the offlining failure Date: Fri, 16 Nov 2018 09:30:19 +0100 Message-Id: <20181116083020.20260-5-mhocko@kernel.org> In-Reply-To: <20181116083020.20260-1-mhocko@kernel.org> References: <20181116083020.20260-1-mhocko@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit Sender: owner-linux-mm@kvack.org List-ID: To: Andrew Morton Cc: Oscar Salvador , Baoquan He , Anshuman Khandual , linux-mm@kvack.org, LKML , Michal Hocko From: Michal Hocko The memory offlining failure reporting is inconsistent and insufficient. Some error paths simply do not report the failure to the log at all. When we do report there are no details about the reason of the failure and there are several of them which makes memory offlining failures hard to debug. Make sure that the memory offlining [mem %#010llx-%#010llx] failed message is printed for all failures and also provide a short textual reason for the failure e.g. [ 1984.506184] rac1 kernel: memory offlining [mem 0x82600000000-0x8267fffffff] failed due to signal backoff this tells us that the offlining has failed because of a signal pending aka user intervention. [akpm: tweak messages a bit] Signed-off-by: Michal Hocko --- mm/memory_hotplug.c | 34 +++++++++++++++++++++++----------- 1 file changed, 23 insertions(+), 11 deletions(-) diff --git a/mm/memory_hotplug.c b/mm/memory_hotplug.c index a92b1b8f6218..88d50e74e3fe 100644 --- a/mm/memory_hotplug.c +++ b/mm/memory_hotplug.c @@ -1553,6 +1553,7 @@ static int __ref __offline_pages(unsigned long start_pfn, unsigned long valid_start, valid_end; struct zone *zone; struct memory_notify arg; + char *reason; mem_hotplug_begin(); @@ -1561,7 +1562,9 @@ static int __ref __offline_pages(unsigned long start_pfn, if (!test_pages_in_a_zone(start_pfn, end_pfn, &valid_start, &valid_end)) { mem_hotplug_done(); - return -EINVAL; + ret = -EINVAL; + reason = "multizone range"; + goto failed_removal; } zone = page_zone(pfn_to_page(valid_start)); @@ -1573,7 +1576,8 @@ static int __ref __offline_pages(unsigned long start_pfn, MIGRATE_MOVABLE, true); if (ret) { mem_hotplug_done(); - return ret; + reason = "failure to isolate range"; + goto failed_removal; } arg.start_pfn = start_pfn; @@ -1582,15 +1586,19 @@ static int __ref __offline_pages(unsigned long start_pfn, ret = memory_notify(MEM_GOING_OFFLINE, &arg); ret = notifier_to_errno(ret); - if (ret) - goto failed_removal; + if (ret) { + reason = "notifier failure"; + goto failed_removal_isolated; + } pfn = start_pfn; repeat: /* start memory hot removal */ ret = -EINTR; - if (signal_pending(current)) - goto failed_removal; + if (signal_pending(current)) { + reason = "signal backoff"; + goto failed_removal_isolated; + } cond_resched(); lru_add_drain_all(); @@ -1607,8 +1615,10 @@ static int __ref __offline_pages(unsigned long start_pfn, * actually in order to make hugetlbfs's object counting consistent. */ ret = dissolve_free_huge_pages(start_pfn, end_pfn); - if (ret) - goto failed_removal; + if (ret) { + reason = "failure to dissolve huge pages"; + goto failed_removal_isolated; + } /* check again */ offlined_pages = check_pages_isolated(start_pfn, end_pfn); if (offlined_pages < 0) @@ -1648,13 +1658,15 @@ static int __ref __offline_pages(unsigned long start_pfn, mem_hotplug_done(); return 0; +failed_removal_isolated: + undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); failed_removal: - pr_debug("memory offlining [mem %#010llx-%#010llx] failed\n", + pr_debug("memory offlining [mem %#010llx-%#010llx] failed due to %s\n", (unsigned long long) start_pfn << PAGE_SHIFT, - ((unsigned long long) end_pfn << PAGE_SHIFT) - 1); + ((unsigned long long) end_pfn << PAGE_SHIFT) - 1, + reason); memory_notify(MEM_CANCEL_OFFLINE, &arg); /* pushback to free area */ - undo_isolate_page_range(start_pfn, end_pfn, MIGRATE_MOVABLE); mem_hotplug_done(); return ret; } -- 2.19.1