On 12/23/2009 01:38 PM, Marcelo Tosatti wrote:
Now that synchronize_srcu_expedited is in the tree, we can continue the
convertion of slots_lock to SRCU.
Results:
up:
Without this patchset, -smp 64 is simply unusable. An _idle_ Linux
guest generates enough interrupts that the system is unable to make any
progress:
[root@monster01 ~]# perf report -g
# Samples: 14214748264314
#
# Overhead Command Shared Object Symbol
# ........ ............... ................................. ......
#
40.81% qemu-system-x86 [kernel] [k]
_raw_spin_lock_irq
|
--- _raw_spin_lock_irq
|
|--99.94%-- __down_read
| down_read
| |
| |--99.82%-- 0xffffffffa00479c4
| | 0xffffffffa003a6c9
| | vfs_ioctl
| | do_vfs_ioctl
| | sys_ioctl
| | system_call
| | __GI_ioctl
| --0.18%-- [...]
--0.06%-- [...]
40.57% qemu-system-x86 [kernel] [k]
_raw_spin_lock_irqsave
|
--- _raw_spin_lock_irqsave
|
|--99.88%-- __up_read
| up_read
| |
| |--99.82%-- 0xffffffffa0047897
| | 0xffffffffa003a6c9
| | vfs_ioctl
| | do_vfs_ioctl
| | sys_ioctl
| | system_call
| | __GI_ioctl
| --0.18%-- [...]
--0.12%-- [...]
With this patchset, -smp 64 flies. Patch to follow. Amazing work!
(and surprising how easy it is to saturate a large system)
--
error compiling committee.c: too many arguments to function
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