9:30 a.m.
Ken'ichi Ohmichi wrote:
Hi Dave,
Thank you for crash-4.0-4.11.
Dave Anderson wrote:
>>It should be noted that while version 4.0-4.11 will at least allow
>>a crash session to initialize, there are several other 2.6.24 related
>>kernel changes that have broken several key commands. Among them, at
>>least on x86_64 kernels:
>>
>> 1. "kmem -[sS]" fails due to changes in the CONFIG_SLUB code between
>> 2.6.22 and 2.6.24.
>> 2. "kmem <address>" doesn't work at all.
>> 3. "kmem -n" fails to show any pgdat-node related information.
>> 4. "kmem -f" doesn't work at all.
>> 5. "kmem -i" doesn't work at all.
>> 6. "runq" for the CFS scheduler no longer shows any queued tasks,
>> but only the relevant structure addresses.
>> 7. The kernel's use of a virtual mem_map array on x86_64 is not
>> handled, and this may lead to other page struct related errors.
This patch fixes #7.
Thanks Ken'ichi. I will also add some extra output for the "mach"
command to reflect the VMEMMAP_START virtual memory segment, as
well as for the "help -m" debug output.
I've also got "kmem -n" working again, which required the
recognition of the 2.6.24 kernel's replacement of the singular
"node_online_map" nodemask with its entry in the "node_states[]"
nodemask array. With the two patches combined, "kmem -i" looks
to be working OK.
I'll update the crash.TODO page with the remaining 2.6.24 items.
Presently I'm looking at fixing the CONFIG_SLUB changes, which
are due to the 2.6.24 change of the kmem_cache.cpu_slab[] array
data type, which used to overload the associated page struct:
struct kmem_cache {
...
struct page *cpu_slab[NR_CPUS];
};
to a new kmem_cache_cpu structure:
struct kmem_cache {
...
#ifdef CONFIG_SMP
struct kmem_cache_cpu *cpu_slab[NR_CPUS];
#else
struct kmem_cache_cpu cpu_slab;
#endif
};
Thanks,
Dave
Thanks
Ken'ichi Ohmichi
---
[PATCH] kmem -p for linux-2.6.24 x86_64.
Since linux-2.6.24, the mem_map (struct page array) is moved to vmalloc space
called "virtual memory map" on x86_64 like Documentation/x86_64/mm.txt:
Virtual memory map with 4 level page tables:
0000000000000000 - 00007fffffffffff (=47 bits) user space, different per mm
hole caused by [48:63] sign extension
ffff800000000000 - ffff80ffffffffff (=40 bits) guard hole
ffff810000000000 - ffffc0ffffffffff (=46 bits) direct mapping of all phys. memory
ffffc10000000000 - ffffc1ffffffffff (=40 bits) hole
ffffc20000000000 - ffffe1ffffffffff (=45 bits) vmalloc/ioremap space
ffffe20000000000 - ffffe2ffffffffff (=40 bits) virtual memory map (1TB)
This patch adds "virtual memory map" to x86_64_IS_VMALLOC_ADDR(), and the sub
command "kmem -p" can display it properly.
Signed-off-by: Ken'ichi Ohmichi <oomichi(a)mxs.nes.nec.co.jp>
---
diff -rpuN a/defs.h b/defs.h
--- a/defs.h 2007-12-07 00:47:06.000000000 +0900
+++ b/defs.h 2007-12-07 10:02:13.000000000 +0900
@@ -2064,6 +2064,8 @@ struct load_module {
#define PAGE_OFFSET (machdep->machspec->page_offset)
#define VMALLOC_START (machdep->machspec->vmalloc_start_addr)
#define VMALLOC_END (machdep->machspec->vmalloc_end)
+#define VMEMMAP_VADDR (machdep->machspec->vmemmap_vaddr)
+#define VMEMMAP_END (machdep->machspec->vmemmap_end)
#define MODULES_VADDR (machdep->machspec->modules_vaddr)
#define MODULES_END (machdep->machspec->modules_end)
@@ -2084,6 +2086,9 @@ struct load_module {
#define MODULES_VADDR_2_6_11 0xffffffff88000000
#define MODULES_END_2_6_11 0xfffffffffff00000
+#define VMEMMAP_VADDR_2_6_24 0xffffe20000000000
+#define VMEMMAP_END_2_6_24 0xffffe2ffffffffff
+
#define USERSPACE_TOP_XEN 0x0000800000000000
#define PAGE_OFFSET_XEN 0xffff880000000000
#define VMALLOC_START_ADDR_XEN 0xffffc20000000000
@@ -3746,6 +3751,8 @@ struct machine_specific {
ulong page_offset;
ulong vmalloc_start_addr;
ulong vmalloc_end;
+ ulong vmemmap_vaddr;
+ ulong vmemmap_end;
ulong modules_vaddr;
ulong modules_end;
ulong phys_base;
diff -rpuN a/x86_64.c b/x86_64.c
--- a/x86_64.c 2007-12-07 00:47:06.000000000 +0900
+++ b/x86_64.c 2007-12-07 10:01:19.000000000 +0900
@@ -184,6 +184,10 @@ x86_64_init(int when)
machdep->machspec->modules_vaddr = MODULES_VADDR_2_6_11;
machdep->machspec->modules_end = MODULES_END_2_6_11;
+ /* 2.6.24 layout */
+ machdep->machspec->vmemmap_vaddr = VMEMMAP_VADDR_2_6_24;
+ machdep->machspec->vmemmap_end = VMEMMAP_END_2_6_24;
+
machdep->uvtop = x86_64_uvtop_level4;
break;
@@ -827,6 +831,7 @@ int
x86_64_IS_VMALLOC_ADDR(ulong vaddr)
{
return ((vaddr >= VMALLOC_START && vaddr <= VMALLOC_END) ||
+ (vaddr >= VMEMMAP_VADDR && vaddr <= VMEMMAP_END) ||
(vaddr >= MODULES_VADDR && vaddr <= MODULES_END));
}
_
--
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