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SubjectRe: [PATCH V1 00/19] perf tools and x86 PTI entry trampolines
On Tue, May 15, 2018 at 03:43:14PM +0300, Adrian Hunter wrote:

SNIP

>
> # Overhead Command Shared Object Symbol
> # ........ ......... ................ ..................................
> #
> 41.91% uname_x_n [kernel.vmlinux] [k] syscall_return_via_sysret
> 24.70% uname_x_n [kernel.vmlinux] [k] entry_SYSCALL_64_trampoline
> 19.22% uname_x_n [kernel.vmlinux] [k] copy_user_enhanced_fast_string
> 4.09% uname_x_n libc-2.19.so [.] __GI___uname
> 3.08% uname_x_n [kernel.vmlinux] [k] do_syscall_64
> 2.32% uname_x_n [kernel.vmlinux] [k] down_read
> 2.27% uname_x_n ld-2.19.so [.] _dl_start
> 1.25% uname_x_n [kernel.vmlinux] [k] up_read
> 0.99% uname_x_n [kernel.vmlinux] [k] entry_SYSCALL_64
> 0.16% uname_x_n [kernel.vmlinux] [k] flush_signal_handlers
> 0.01% perf [kernel.vmlinux] [k] native_sched_clock
> 0.00% perf [kernel.vmlinux] [k] native_write_msr
>
>
> Adrian Hunter (17):
> kallsyms: Simplify update_iter_mod()
> x86: kcore: Give entry trampolines all the same offset in kcore
> perf tools: Use the _stest symbol to identify the kernel map when loading kcore
> perf tools: Fix kernel_start for PTI on x86
> perf tools: Workaround missing maps for x86 PTI entry trampolines
> perf tools: Fix map_groups__split_kallsyms() for entry trampoline symbols
> perf tools: Allow for extra kernel maps
> perf tools: Create maps for x86 PTI entry trampolines
> perf tools: Synthesize and process mmap events for x86 PTI entry trampolines

the perf tools patches look good to me:

Acked-and-tested-by: Jiri Olsa <jolsa@kernel.org>

jirka

> perf buildid-cache: kcore_copy: Keep phdr data in a list
> perf buildid-cache: kcore_copy: Keep a count of phdrs
> perf buildid-cache: kcore_copy: Calculate offset from phnum
> perf buildid-cache: kcore_copy: Layout sections
> perf buildid-cache: kcore_copy: Iterate phdrs
> perf buildid-cache: kcore_copy: Get rid of kernel_map
> perf buildid-cache: kcore_copy: Copy x86 PTI entry trampoline sections
> perf buildid-cache: kcore_copy: Amend the offset of sections that remap kernel text

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