Since the following kernel commits split slab info from struct page
into struct slab, crash cannot get several slab related offsets from
struct page.
d122019bf061 ("mm: Split slab into its own type")
401fb12c68c2 ("mm: Differentiate struct slab fields by sl*b implementations")
07f910f9b729 ("mm: Remove slab from struct page")
Without the patch, "kmem -s|-S" options cannot work
correctly with the following errors:
crash> kmem -s
kmem: invalid structure member offset: page_active
FILE: memory.c LINE: 12225 FUNCTION: verify_slab_overload_page()
[/usr/bin/crash] error trace: 532526 => 53353a => 5e0a6a => 5e09dc
[Detaching after fork from child process 28299]
5e09dc: OFFSET_verify.part.36+92
[Detaching after fork from child process 28301]
5e0a6a: OFFSET_verify+58
[Detaching after fork from child process 28303]
53353a: verify_slab_overload_page+588
[Detaching after fork from child process 28305]
532526: do_slab_chain_slab_overload_page+1171
kmem: invalid structure member offset: page_active
FILE: memory.c LINE: 12225 FUNCTION: verify_slab_overload_page()
Signed-off-by: xiaer1921 <xiaer1921@xxxxxxxxx>
---
memory.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/memory.c b/memory.c
index 8448ddc..388b12d 100644
--- a/memory.c
+++ b/memory.c
@@ -680,6 +680,8 @@ vm_init(void)
MEMBER_OFFSET_INIT(slab_s_mem, "slab", "s_mem");
MEMBER_OFFSET_INIT(slab_inuse, "slab", "inuse");
MEMBER_OFFSET_INIT(slab_free, "slab", "free");
+ MEMBER_OFFSET_INIT(page_s_mem, "slab", "s_mem");
+ MEMBER_OFFSET_INIT(page_active, "slab", "active");
/*
* slab members were moved to an anonymous union in 2.6.39.
*/
@@ -691,6 +693,10 @@ vm_init(void)
ANON_MEMBER_OFFSET_INIT(slab_inuse, "slab", "inuse");
if (INVALID_MEMBER(slab_free))
ANON_MEMBER_OFFSET_INIT(slab_free, "slab", "free");
+ if (INVALID_MEMBER(page_s_mem))
+ ANON_MEMBER_OFFSET_INIT(page_s_mem, "slab", "s_mem");
+ if (INVALID_MEMBER(page_active))
+ ANON_MEMBER_OFFSET_INIT(page_active, "slab", "active");
}
MEMBER_OFFSET_INIT(array_cache_avail, "array_cache", "avail");
--
2.7.4
================================================================
Thanks.
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