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Re: [PATCH] btrace: kernel address filtering
- From: Pedro Alves <palves at redhat dot com>
- To: Markus Metzger <markus dot t dot metzger at intel dot com>
- Cc: gdb-patches at sourceware dot org
- Date: Tue, 08 Sep 2015 11:24:35 +0100
- Subject: Re: [PATCH] btrace: kernel address filtering
- Authentication-results: sourceware.org; auth=none
- References: <1441122141-26033-1-git-send-email-markus dot t dot metzger at intel dot com>
On 09/01/2015 04:42 PM, Markus Metzger wrote:
> --- a/gdb/nat/linux-btrace.h
> +++ b/gdb/nat/linux-btrace.h
> @@ -101,10 +101,11 @@ struct btrace_target_info
> } variant;
> #endif /* HAVE_LINUX_PERF_EVENT_H */
> - /* The size of a pointer in bits for this thread.
> - The information is used to identify kernel addresses in order to skip
> - records from/to kernel space. */
> - int ptr_bits;
> + /* The kernel start address.
> + The information is used to tell kernel addresses from user addresses in
> + order to skip records from kernel space. We assume that any address
> + smaller than KERNEL_START is in user space. */
> + uint64_t kernel_start;
Is there a reason we need to store the kernel's start address on every thread?