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SubjectRe: [GIT PULL] perf fixes
On 2013.10.28 at 09:28 +0100, Markus Trippelsdorf wrote:
> On 2013.10.26 at 14:24 +0200, Ingo Molnar wrote:
> > - Reversal of the new 'MMAP2' extended mmap record ABI, introduced
> > in this merge window. (Patches were proposed to fix it but it was
> > all a bit late and we felt it's safer to just delay the ABI one
> > more kernel release and do it right.)
>
> commit 3090ffb5a2515990182f3f55b0688a7817325488
> Author: Stephane Eranian <eranian@google.com>
> Date: Thu Oct 17 19:32:15 2013 +0200
>
> perf: Disable PERF_RECORD_MMAP2 support
>
> The commit above breaks "perf top" on my system, because it causes only
> [kernel] symbols to show up in the list. When I revert the commit I get
> the usual mixture of userspace and kernel symbols in the list.

Forgot to mention that this happens on an otherwise idle machine. If I
run CPU intensive apps they'll show up eventually.

Example (current Linus tree):

PerfTop: 593 irqs/sec kernel:80.6% exact: 0.0% [4000Hz cycles], (all, 4 CPUs)
----------------------------------------------------------------------------------------------

57.75% [kernel] [k] amd_e400_idle
28.66% [unknown] [.] 0x0000000000450bc8
1.51% [kernel] [k] kallsyms_expand_symbol.const
1.22% [kernel] [k] cpu_startup_entry
1.13% [kernel] [k] number.isra.1
0.77% [kernel] [k] clear_page_c
0.74% [kernel] [k] memcpy
0.46% [kernel] [k] task_waking_fair
0.45% [kernel] [k] _raw_spin_lock_irqsave
0.42% [kernel] [k] _raw_spin_unlock_irqrestore
0.39% [kernel] [k] format_decode
0.34% [kernel] [k] do_sys_poll
0.31% [kernel] [k] current_kernel_time
0.30% [kernel] [k] vsnprintf
0.29% [kernel] [k] native_apic_mem_write
0.28% [kernel] [k] select_task_rq_fair
0.26% [kernel] [k] swiotlb_free_coherent
0.26% [kernel] [k] irq_entries_start
0.2n% [kernel] [k] strnlen

With the commit above reverted:

PerfTop: 907 irqs/sec kernel:73.3% exact: 0.0% [4000Hz cycles], (all, 4 CPUs)
-----------------------------------------------------------------------------------------------

30.89% [kernel] [k] amd_e400_idle
6.88% [unknown] [.] 0x00007f346f2ef3a6
5.22% libc-2.18.90.so [.] strcmp
3.65% libc-2.18.90.so [.] strstr
2.65% libbfd-2.24.51.20131018.so [.] d_print_comp.part.8
2.61% perf [.] symbols__insert
2.18% [kernel] [k] cpu_startup_entry
1.82% perf [.] symbol_filter
1.73% perf [.] rb_next
1.58% libc-2.18.90.so [.] critical_factorization
1.34% libelf-0.156.so [.] gelf_getsym
1.28% libQtGui.so.4.8.5 [.] qt_alphargbblit_quint32(QRasterBuffer*, int, int, unsigned int, unsigned int const*, int, int, int, QClipData
1.25% libc-2.18.90.so [.] __libc_calloc
1.17% libc-2.18.90.so [.] _int_malloc
1.15% libc-2.18.90.so [.] strchr
0.97% xmobar [.] 0x000000000000c922
0.97% [kernel] [k] number.isra.1
0.96% libpthread-2.18.90.so [.] pthread_rwlock_rdlock
0.96% libc-2.18.90.so [.] memcpy@@GLIBC_2.14
0.94% perf [.] dso__load_sym
0.93% libc-2.18.90.so [.] memchr
0.84% libbfd-2.24.51.20131018.so [.] d_name
0.75% [kernel] [k] clear_page_c
0.73% libpthread-2.18.90.so [.] pthread_rwlock_unlock
0.66% libc-2.18.90.so [.] memset

--
Markus


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