kernel_optimize_test/tools
Andi Kleen bec1967204 perf tools: Try to increase the file descriptor limits on EMFILE
perf stat -a needs 10 open file descriptors per logical CPU
perf stat -a -dddd needs 20 open fds for each.

This implies that stat -a doesn't work on any system with the default
ulimit -n 1024 which has more than ~100 CPUs and stat -a -dddd doesn't
work on anything with more than 46 CPUs.

Longer term there needs to be probably some way to lower the file
descriptor requirements. This would need some changes in the kernel/user
interface.

But short term this patch just tries to increase the file descriptor
limit in perf itself, when it runs into a EMFILE.

It first sets it to the hard limit, and then tries to increase the hard
limit.

On Fedora systems the default seems to be soft limit 1024 and hard limit
4*1024. So even non root can support 409 or 186 CPUs respectively. root
can go far higher.

Signed-off-by: Andi Kleen <ak@linux.intel.com>
Link: http://lkml.kernel.org/r/1375670486-15480-1-git-send-email-andi@firstfloor.org
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
2013-08-16 17:17:57 -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: KVP: Fix a bug in IPV6 subnet enumeration 2013-07-16 23:19:19 -07:00
include/tools tools/include: use stdint types for user-space byteshift headers 2013-07-03 16:02:28 +02:00
lguest lguest: fix example launcher compilation for broken glibc headers. 2013-07-04 11:25:07 +09:30
lib Revert "tools lib lk: Fix for cross build" 2013-08-07 17:35:41 -03:00
net filter: add minimal BPF JIT image disassembler 2013-03-21 11:35:41 -04:00
nfsd
perf perf tools: Try to increase the file descriptor limits on EMFILE 2013-08-16 17:17:57 -03:00
power cpupower: Add Haswell family 0x45 specific idle monitor to show PC8,9,10 states 2013-07-05 01:52:19 +02:00
scripts tools: Get only verbose output with V=1 2013-07-08 17:31:34 -03:00
testing Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-07-09 18:24:39 -07:00
usb tools: usb: ffs-test: Fix build failure 2013-03-07 12:23:17 +08:00
virtio tools/virtio: move module license stub to module.h 2013-07-09 10:47:53 +09:30
vm tools/vm: Switch to liblk library 2013-03-15 13:06:01 -03:00
Makefile Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net-next 2013-05-01 14:08:52 -07:00