kernel.git/arch/x86/include/asm/trace/exceptions.h, branch linux-4.12.y

tracing: Have the reg function allow to fail

2016-12-09T14:13:30Z

Some tracepoints have a registration function that gets enabled when the tracepoint is enabled. There may be cases that the registraction function must fail (for example, can't allocate enough memory). In this case, the tracepoint should also fail to register, otherwise the user would not know why the tracepoint is not working. Cc: David Howells Cc: Seiji Aguchi Cc: Anton Blanchard Cc: Mathieu Desnoyers Signed-off-by: Steven Rostedt

x86, trace: Change user|kernel_page_fault to page_fault_user|kernel

2013-11-11T16:15:40Z

Tracepoints are named hierachially, and it makes more sense to keep a general flow of information level from general to specific from left to right, i.e. x86_exceptions.page_fault_user|kernel rather than x86_exceptions.user|kernel_page_fault Suggested-by: Ingo Molnar Acked-by: Seiji Aguchi Signed-off-by: H. Peter Anvin Link: http://lkml.kernel.org/r/20131111082955.GB12405@gmail.com

x86, trace: Add page fault tracepoints

2013-11-08T22:15:49Z

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 Link: http://lkml.kernel.org/r/52716E67.6090705@hds.com Signed-off-by: H. Peter Anvin