linux-kernel - [PATCH v4 1/2] Documentation: kdump: remind user of nr

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Message-ID: <1470191495-32020-1-git-send-email-zhouwj-fnst@cn.fujitsu.com>
Date:	Wed, 3 Aug 2016 10:31:34 +0800
From:	Zhou Wenjian <zhouwj-fnst@...fujitsu.com>
To:	<linux-kernel@...r.kernel.org>
CC:	<kexec@...ts.infradead.org>, <bhe@...hat.com>, <dyoung@...hat.com>,
	<d.hatayama@...fujitsu.com>
Subject: [PATCH v4 1/2] Documentation: kdump: remind user of nr_cpus

v3->v4: update the description of bring up SMP dump-capture kernel
v2->v3: add description of nr_cpus.
v1->v2: change nr_cpus to maxcpus

nr_cpus can help to save memory. So we should remind user of it.

Signed-off-by: Zhou Wenjian <zhouwj-fnst@...fujitsu.com>
---
 Documentation/kdump/kdump.txt | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
index 88ff63d..b474060 100644
--- a/Documentation/kdump/kdump.txt
+++ b/Documentation/kdump/kdump.txt
@@ -393,6 +393,8 @@ Notes on loading the dump-capture kernel:
 * We generally don' have to bring up a SMP kernel just to capture the
   dump. Hence generally it is useful either to build a UP dump-capture
   kernel or specify maxcpus=1 option while loading dump-capture kernel.
+  Note, though maxcpus always works, we should replace it by nr_cpus to
+  save memory if supported by the current ARCH, such as x86.
 
 * For s390x there are two kdump modes: If a ELF header is specified with
   the elfcorehdr= kernel parameter, it is used by the kdump kernel as it
-- 
1.8.3.1