linux-kernel - [PATCH v4 RFT 2/2] powerpc/fadump: update documentation about 'fadump

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Message-Id: <20170502155611.6789-2-msuchanek@suse.de>
Date:   Tue,  2 May 2017 17:56:11 +0200
From:   Michal Suchanek <msuchanek@...e.de>
To:     Benjamin Herrenschmidt <benh@...nel.crashing.org>,
        Paul Mackerras <paulus@...ba.org>,
        Michael Ellerman <mpe@...erman.id.au>,
        Jonathan Corbet <corbet@....net>,
        Hari Bathini <hbathini@...ux.vnet.ibm.com>,
        Michal Suchanek <msuchanek@...e.de>,
        Vlastimil Babka <vbabka@...e.cz>,
        Michal Hocko <mhocko@...e.cz>, linuxppc-dev@...ts.ozlabs.org,
        linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH v4 RFT 2/2] powerpc/fadump: update documentation about 'fadump_append=' parameter

With the introduction of 'fadump_append=' parameter to pass additional
parameters to fadump (capture) kernel, update documentation about it.

Signed-off-by: Hari Bathini <hbathini@...ux.vnet.ibm.com>
Signed-off-by: Michal Suchanek <msuchanek@...e.de>
---
 Documentation/powerpc/firmware-assisted-dump.txt | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/Documentation/powerpc/firmware-assisted-dump.txt b/Documentation/powerpc/firmware-assisted-dump.txt
index 9cabaf8..99ab8f4 100644
--- a/Documentation/powerpc/firmware-assisted-dump.txt
+++ b/Documentation/powerpc/firmware-assisted-dump.txt
@@ -162,7 +162,11 @@ How to enable firmware-assisted dump (fadump):
 
 1. Set config option CONFIG_FA_DUMP=y and build kernel.
 2. Boot into linux kernel with 'fadump=on' kernel cmdline option.
-3. Optionally, user can also set 'crashkernel=' kernel cmdline
+3. A user can pass additional kernel parameters as a comma separated list
+   through 'fadump_append=' parameter, to be be appended when fadump is active.
+   This can be used to pass parameters like nr_cpus=1, numa=off to reduce
+   memory consumption during dump capture.
+4. Optionally, user can also set 'fadump_reserve_mem=' kernel cmdline
    to specify size of the memory to reserve for boot memory dump
    preservation.
 
@@ -172,6 +176,8 @@ NOTE: 1. 'fadump_reserve_mem=' parameter has been deprecated. Instead
       2. If firmware-assisted dump fails to reserve memory then it
          will fallback to existing kdump mechanism if 'crashkernel='
          option is set at kernel cmdline.
+      3. 'fadump_append=' parameter con be quoted to append multiple arguments
+         as in 'fadump_append="nr_cpus=8 numa=off"'
 
 Sysfs/debugfs files:
 ------------
-- 
2.10.2