path: root/Documentation/kdump/kdump.txt
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authorXishi Qiu <qiuxishi@huawei.com>2013-03-25 19:14:16 +0800
committerTony Luck <tony.luck@intel.com>2013-04-02 09:40:03 -0700
commit797f6a684f28dbb00f9e9719315574e344fcbf53 (patch)
tree117a1438e86efe109a47a000975a02edc13e344c /Documentation/kdump/kdump.txt
parent83d435dd6e24b17955f91480f633bb39f0a7c2b4 (diff)
Add size restriction to the kdump documentation
In efi_init() memory aligns in IA64_GRANULE_SIZE(16M). If set "crashkernel=1024M-:600M" and use sparse memory model, when crash kernel booting it changes [128M-728M] to [128M-720M]. But initrd memory is in [709M-727M], and virt_addr_valid() *can not* check the invalid pages when freeing initrd memory, because there are some pages missed at the end of the section, and this causes error. ... Unpacking initramfs... Freeing initrd memory: 19648kB freed BUG: Bad page state in process swapper pfn:02d00 page:e0000000102dd800 flags:(null) count:0 mapcount:1 mapping:(null) index:0 Call Trace: [<a000000100018dc0>] show_stack+0x80/0xa0 sp=e000000021e8fbd0 bsp=e000000021e81360 [<a00000010090fcc0>] dump_stack+0x30/0x50 sp=e000000021e8fda0 bsp=e000000021e81348 [<a0000001001a3180>] bad_page+0x280/0x380 sp=e000000021e8fda0 bsp=e000000021e81308 [<a0000001001a8740>] free_hot_cold_page+0x3a0/0x5c0 sp=e000000021e8fda0 bsp=e000000021e812a0 [<a0000001001a8a50>] free_hot_page+0x30/0x60 sp=e000000021e8fda0 bsp=e000000021e81280 [<a0000001001a8b30>] __free_pages+0xb0/0xe0 sp=e000000021e8fda0 bsp=e000000021e81258 [<a0000001001a8c00>] free_pages+0xa0/0xc0 sp=e000000021e8fda0 bsp=e000000021e81230 [<a000000100bb40c0>] free_initrd_mem+0x230/0x290 sp=e000000021e8fda0 bsp=e000000021e811d8 [<a000000100ba6620>] populate_rootfs+0x1c0/0x280 sp=e000000021e8fdb0 bsp=e000000021e811a0 [<a00000010000ac30>] do_one_initcall+0x3b0/0x3e0 sp=e000000021e8fdb0 bsp=e000000021e81158 [<a000000100ba0a90>] kernel_init+0x3f0/0x4b0 sp=e000000021e8fdb0 bsp=e000000021e81108 [<a000000100016890>] kernel_thread_helper+0xd0/0x100 sp=e000000021e8fe30 bsp=e000000021e810e0 [<a00000010000a4c0>] start_kernel_thread+0x20/0x40 sp=e000000021e8fe30 bsp=e000000021e810e0 ... In "http://marc.info/?l=linux-arch&m=136147092429314&w=2" Tony said: "Perhaps in Documentation/kdump/kdump.txt (which the crashkernel entry in kernel-parameters.txt points at). The ia64 section of kdump.txt notes that the start address will be rounded up to a GRANULE boundary, but doesn't talk about restrictions on the size." This patch add size restriction to the documentation of kdump. Signed-off-by: Xishi Qiu <qiuxishi@huawei.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'Documentation/kdump/kdump.txt')
1 files changed, 1 insertions, 0 deletions
diff --git a/Documentation/kdump/kdump.txt b/Documentation/kdump/kdump.txt
index 13f1aa09b938..9c7fd988e299 100644
--- a/Documentation/kdump/kdump.txt
+++ b/Documentation/kdump/kdump.txt
@@ -297,6 +297,7 @@ Boot into System Kernel
On ia64, 256M@256M is a generous value that typically works.
The region may be automatically placed on ia64, see the
dump-capture kernel config option notes above.
+ If use sparse memory, the size should be rounded to GRANULE boundaries.
On s390x, typically use "crashkernel=xxM". The value of xx is dependent
on the memory consumption of the kdump system. In general this is not

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