Alexander Shishkin a09d31f452 perf/x86/intel/ds: Work around BTS leaking kernel addresses ... BTS leaks kernel addresses even in userspace-only mode due to imprecise IP sampling, so sometimes syscall entry points or page fault handler addresses end up in a userspace trace. Since this driver uses a relatively small buffer for BTS records and it has to iterate through them anyway, it can also take on the additional job of filtering out the records that contain kernel addresses when kernel space tracing is not enabled. This patch changes the bts code to skip the offending records from perf output. In order to request the exact amount of space on the ring buffer, we need to do an extra pass through the records to know how many there are of the valid ones, but considering the small size of the buffer, this extra pass adds very little overhead to the nmi handler. This way we won't end up with awkward IP samples with zero IPs in the perf stream. Signed-off-by: Alexander Shishkin <alexander.shishkin@linux.intel.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@infradead.org> Cc: Arnaldo Carvalho de Melo <acme@redhat.com> Cc: Jiri Olsa <jolsa@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Stephane Eranian <eranian@google.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Vince Weaver <vincent.weaver@maine.edu> Cc: hpa@zytor.com Link: http://lkml.kernel.org/r/1441030168-6853-2-git-send-email-alexander.shishkin@linux.intel.com Signed-off-by: Ingo Molnar <mingo@kernel.org>		2015-09-13 11:27:21 +02:00
..
boot	lib/decompressors: use real out buf size for gunzip with kernel	2015-09-10 13:29:01 -07:00
configs	Merge branch 'drm-next' of git://people.freedesktop.org/~airlied/linux	2015-09-04 15:49:32 -07:00
crypto	crypto: ghash-clmulni: specify context size for ghash async algorithm	2015-09-04 23:21:07 +08:00
entry	sys_membarrier(): system-wide memory barrier (generic, x86)	2015-09-11 15:21:34 -07:00
ia32
include	Merge branch 'akpm' (patches from Andrew)	2015-09-10 18:19:42 -07:00
kernel	perf/x86/intel/ds: Work around BTS leaking kernel addresses	2015-09-13 11:27:21 +02:00
kvm	Merge branch 'akpm' (patches from Andrew)	2015-09-10 18:19:42 -07:00
lguest	Merge branch 'x86-apic-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip	2015-09-01 15:20:51 -07:00
lib	Linux 4.3-rc1	2015-09-13 11:25:35 +02:00
math-emu
mm	mm, mpx: add "vm_flags_t vm_flags" arg to do_mmap_pgoff()	2015-09-10 13:29:01 -07:00
net
oprofile
pci
platform	kexec: split kexec_load syscall from kexec core code	2015-09-10 13:29:01 -07:00
power
purgatory
ras
realmode
tools
um
video
xen	xen: MFN/GFN/BFN terminology changes for 4.3-rc0	2015-09-10 16:21:11 -07:00
.gitignore
Kbuild
Kconfig	kexec: split kexec_load syscall from kexec core code	2015-09-10 13:29:01 -07:00
Kconfig.cpu
Kconfig.debug
Makefile
Makefile_32.cpu
Makefile.um