linux/tools
Arnaldo Carvalho de Melo 1be300f4cc perf tools: Make the mmap length autotuning more robust
If /proc/sys/kernel/perf_event_mlock_kb is not (power of 2 + PAGE_SIZE_in_kb)
and we let the perf tools do mmap length autosizing based on that, then, for
non-CAP_IPC_LOCK users when /proc/sys/kernel/perf_event_paranoid is > -1, then
we get an -EINVAL that ends up in:

  [acme@ssdandy linux]$ trace usleep 1
  Invalid argument
  [acme@ssdandy linux]$ perf record usleep 1
  failed to mmap with 22 (Invalid argument)

After this fix:

  [acme@ssdandy linux]$ trace usleep 1
  <SNIP>
   0.806 ( 0.006 ms): munmap(addr: 0x7f7e4740a000, len: 66467) = 0
   0.869 ( 0.002 ms): brk(                                   ) = 0x7bb000
   0.873 ( 0.003 ms): brk(brk: 0x7dc000                      ) = 0x7dc000
   0.877 ( 0.001 ms): brk(                                   ) = 0x7dc000
   0.953 ( 0.058 ms): nanosleep(rqtp: 0x7fff26ab9420         ) = 0
   0.959 ( 0.000 ms): exit_group(
  [acme@ssdandy linux]$ perf record usleep 1
  [ perf record: Woken up 1 times to write data ]
  [ perf record: Captured and wrote 0.017 MB perf.data (~759 samples) ]
  [acme@ssdandy linux]$

Cc: Adrian Hunter <adrian.hunter@intel.com>
Cc: Borislav Petkov <bp@suse.de>
Cc: David Ahern <dsahern@gmail.com>
Cc: Don Zickus <dzickus@redhat.com>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Mike Galbraith <efault@gmx.de>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Stephane Eranian <eranian@google.com>
Link: http://lkml.kernel.org/n/tip-6p6l5ou6jev6o7ymc4nn1n2a@git.kernel.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2014-12-17 11:58:14 -03:00
..
cgroup cgroups: fix cgroup_event_listener error handling 2013-01-08 10:00:44 -08:00
firewire tools/firewire: nosy-dump: check for allocation failure 2012-12-02 20:10:18 +01:00
hv Tools: hv: fix file overwriting of hv_fcopy_daemon 2014-07-09 14:21:26 -07:00
include tools: Adopt rounddown_pow_of_two and deps 2014-12-17 11:58:13 -03:00
lguest tools/lguest: offer VIRTIO_F_ANY_LAYOUT for net device. 2013-07-15 11:18:32 +09:30
lib tools lib: Move asm-generic/bitops/find.h code to tools/include and tools/lib 2014-12-17 11:14:48 -03:00
net tools: bpf_jit_disasm: increase image buffer size 2014-05-16 16:44:08 -04:00
nfsd
perf perf tools: Make the mmap length autotuning more robust 2014-12-17 11:58:14 -03:00
power ACPICA: acpiexec: Do not put STDIN into raw mode unless it is a terminal. 2014-10-21 00:39:40 +02:00
scripts tools lib traceevent: Add global QUIET_CC_FPIC build output 2013-12-19 16:18:10 -03:00
testing Merge branch 'rcu/next' of git://git.kernel.org/pub/scm/linux/kernel/git/paulmck/linux-rcu into core/rcu 2014-11-20 08:57:58 +01:00
thermal/tmon calloc/xcalloc: Fix argument order 2014-12-09 10:06:29 -03:00
time tools: add script to test udelay 2014-07-23 10:16:38 -07:00
usb Linux 3.17-rc5 2014-09-16 09:53:59 -05:00
virtio tools: Consolidate types.h 2014-05-01 21:22:39 +02:00
vm mm/balloon_compaction: add vmstat counters and kpageflags bit 2014-10-09 22:26:01 -04:00
Makefile tools/liblockdep: Build liblockdep from tools/Makefile 2014-05-08 13:34:45 -04:00