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authorTong Li <tong.n.li@intel.com>2006-02-03 06:04:09 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-03 11:32:04 -0500
commit23332c2e9da16b717f18fd95bc90211a663aa6ee (patch)
tree873e445688472fd1726c0e48113f63a585d03b39 /arch/i386/oprofile/op_counter.h
parent8145916996b91d42b8bb4b0fcd508af295222c7c (diff)
[PATCH] OProfile: fixed x86_64 incorrect kernel call graphs
Fix the problem in kernel 2.6.15.1 (and early versions) that OProfile on x86_64 does not correctly collect the stack traces for kernel functions. The original code in valid_kernel_stack() in arch/i386/oprofile/backtrace.c assumes that the frame pointer (headaddr) should be greater than stack (i.e., regs). This assumption is wrong for x86_64 because NMIs in x86_64 use a seperate stack different from the kernel stack. Therefore, the variable stack now points to some location on the NMI stack, which turns out to be at a higher address than the frame pointer (headaddr) on the kernel stack. The correct comparison here should be between headaddr and regs->rsp for x86_64. Signed-off-by: Tong Li <tong.n.li@intel.com> Cc: John Levon <levon@movementarian.org> Cc: Philippe Elie <phil.el@wanadoo.fr> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/oprofile/op_counter.h')
0 files changed, 0 insertions, 0 deletions