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| author | Seiji Aguchi <seiji.aguchi@hds.com> | 2013-10-31 00:39:03 +0400 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2013-11-09 02:15:49 +0400 |
| commit | d34603b07c4255b2b00a546d34f297ccd50ae4c6 (patch) | |
| tree | 133e7788eb885d11cecc0590184f8825f4c0836f /arch/x86/include/asm/trace/exceptions.h | |
| parent | ac7956e2699380b8b10146ec2ba8cbe43a03ff7a (diff) | |
| download | linux-d34603b07c4255b2b00a546d34f297ccd50ae4c6.tar.xz | |
x86, trace: Add page fault tracepoints
This patch introduces page fault tracepoints to x86 architecture
by switching IDT.
Two events, for user and kernel spaces, are introduced at the beginning
of page fault handler for tracing.
- User space event
There is a request of page fault event for user space as below.
https://lkml.kernel.org/r/1368079520-11015-2-git-send-email-fdeslaur+()+gmail+!+com
https://lkml.kernel.org/r/1368079520-11015-1-git-send-email-fdeslaur+()+gmail+!+com
- Kernel space event:
When we measure an overhead in kernel space for investigating performance
issues, we can check if it comes from the page fault events.
Signed-off-by: Seiji Aguchi <seiji.aguchi@hds.com>
Link: http://lkml.kernel.org/r/52716E67.6090705@hds.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
Diffstat (limited to 'arch/x86/include/asm/trace/exceptions.h')
| -rw-r--r-- | arch/x86/include/asm/trace/exceptions.h | 52 |
1 files changed, 52 insertions, 0 deletions
diff --git a/arch/x86/include/asm/trace/exceptions.h b/arch/x86/include/asm/trace/exceptions.h new file mode 100644 index 000000000000..86540c094ecc --- /dev/null +++ b/arch/x86/include/asm/trace/exceptions.h @@ -0,0 +1,52 @@ +#undef TRACE_SYSTEM +#define TRACE_SYSTEM exceptions + +#if !defined(_TRACE_PAGE_FAULT_H) || defined(TRACE_HEADER_MULTI_READ) +#define _TRACE_PAGE_FAULT_H + +#include <linux/tracepoint.h> + +extern void trace_irq_vector_regfunc(void); +extern void trace_irq_vector_unregfunc(void); + +DECLARE_EVENT_CLASS(x86_exceptions, + + TP_PROTO(unsigned long address, struct pt_regs *regs, + unsigned long error_code), + + TP_ARGS(address, regs, error_code), + + TP_STRUCT__entry( + __field( unsigned long, address ) + __field( unsigned long, ip ) + __field( unsigned long, error_code ) + ), + + TP_fast_assign( + __entry->address = address; + __entry->ip = regs->ip; + __entry->error_code = error_code; + ), + + TP_printk("address=%pf ip=%pf error_code=0x%lx", + (void *)__entry->address, (void *)__entry->ip, + __entry->error_code) ); + +#define DEFINE_PAGE_FAULT_EVENT(name) \ +DEFINE_EVENT_FN(x86_exceptions, name, \ + TP_PROTO(unsigned long address, struct pt_regs *regs, \ + unsigned long error_code), \ + TP_ARGS(address, regs, error_code), \ + trace_irq_vector_regfunc, \ + trace_irq_vector_unregfunc); + +DEFINE_PAGE_FAULT_EVENT(user_page_fault); +DEFINE_PAGE_FAULT_EVENT(kernel_page_fault); + +#undef TRACE_INCLUDE_PATH +#define TRACE_INCLUDE_PATH . +#define TRACE_INCLUDE_FILE exceptions +#endif /* _TRACE_PAGE_FAULT_H */ + +/* This part must be outside protection */ +#include <trace/define_trace.h> |