Jonathan Ryshpan wrote:
I had thought that they would come from the .config file from either the
kernel-source.rpm or the kernel-devel.rpm for my current kernel. But
these two files are different. I run the latest kernel, namely
linux-2.6.30.x86_64 . In particular, is my current kernel PREEMPT or
VOLUNTARY_PREEMPT? Any way to find this out?
I know I can get the kernel I want (PREEMPT) by rebuilding, but it would
be nice to avoid this, and also to be able to settle this question in
general.
Thanks - jon
=========== diffs between kernel-source and kernel-devel ===========
$ diff -c ~/rpmbuild/BUILD/kernel-2.6.30/linux-2.6.30.x86_64/.config /usr/src/kernels/2.6.30.9-90.fc11.x86_64/.config
*** /home/jonrysh/rpmbuild/BUILD/kernel-2.6.30/linux-2.6.30.x86_64/.config Tue Oct 27 20:25:44 2009
--- /usr/src/kernels/2.6.30.9-90.fc11.x86_64/.config Sat Oct 17 08:38:07
2009
***************
*** 1,7 ****
#
# Automatically generated make config: don't edit
! # Linux kernel version: 2.6.30.8
! # Tue Oct 27 20:25:44 2009
#
CONFIG_64BIT=y
# CONFIG_X86_32 is not set
--- 1,7 ----
#
# Automatically generated make config: don't edit
! # Linux kernel version: 2.6.30.9-90.fc11.x86_64
! # Sat Oct 17 11:22:55 2009
#
CONFIG_64BIT=y
# CONFIG_X86_32 is not set
***************
*** 284,291 ****
CONFIG_SCHED_SMT=y
CONFIG_SCHED_MC=y
# CONFIG_PREEMPT_NONE is not set
! # CONFIG_PREEMPT_VOLUNTARY is not set
! CONFIG_PREEMPT=y
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
--- 284,291 ----
CONFIG_SCHED_SMT=y
CONFIG_SCHED_MC=y
# CONFIG_PREEMPT_NONE is not set
! CONFIG_PREEMPT_VOLUNTARY=y
! # CONFIG_PREEMPT is not set
CONFIG_X86_LOCAL_APIC=y
CONFIG_X86_IO_APIC=y
CONFIG_X86_REROUTE_FOR_BROKEN_BOOT_IRQS=y
***************
*** 3298,3304 ****
CONFIG_USB_STORAGE_ALAUDA=m
CONFIG_USB_STORAGE_ONETOUCH=m
CONFIG_USB_STORAGE_KARMA=m
! CONFIG_USB_STORAGE_CYPRESS_ATACB=m
# CONFIG_USB_LIBUSUAL is not set
#
--- 3298,3304 ----
CONFIG_USB_STORAGE_ALAUDA=m
CONFIG_USB_STORAGE_ONETOUCH=m
CONFIG_USB_STORAGE_KARMA=m
! # CONFIG_USB_STORAGE_CYPRESS_ATACB is not set
# CONFIG_USB_LIBUSUAL is not set
#
***************
*** 3969,3975 ****
# CONFIG_DEBUG_OBJECTS is not set
# CONFIG_SLUB_DEBUG_ON is not set
# CONFIG_SLUB_STATS is not set
- CONFIG_DEBUG_PREEMPT=y
# CONFIG_DEBUG_RT_MUTEXES is not set
# CONFIG_RT_MUTEX_TESTER is not set
# CONFIG_DEBUG_SPINLOCK is not set
--- 3969,3974 ----
***************
*** 3977,3983 ****
# CONFIG_DEBUG_LOCK_ALLOC is not set
# CONFIG_PROVE_LOCKING is not set
# CONFIG_LOCK_STAT is not set
- CONFIG_TRACE_IRQFLAGS=y
CONFIG_DEBUG_SPINLOCK_SLEEP=y
# CONFIG_DEBUG_LOCKING_API_SELFTESTS is not set
CONFIG_STACKTRACE=y
--- 3976,3981 ----
***************
*** 4024,4031 ****
#
CONFIG_FUNCTION_TRACER=y
# CONFIG_FUNCTION_GRAPH_TRACER is not set
! CONFIG_IRQSOFF_TRACER=y
! # CONFIG_PREEMPT_TRACER is not set
CONFIG_SYSPROF_TRACER=y
CONFIG_SCHED_TRACER=y
CONFIG_CONTEXT_SWITCH_TRACER=y
--- 4022,4028 ----
#
CONFIG_FUNCTION_TRACER=y
# CONFIG_FUNCTION_GRAPH_TRACER is not set
! # CONFIG_IRQSOFF_TRACER is not set
CONFIG_SYSPROF_TRACER=y
CONFIG_SCHED_TRACER=y
CONFIG_CONTEXT_SWITCH_TRACER=y
The config parameters for kernels installed by RPM packages are in
/boot. Look for "config-(kernelversion)" files. For example, to
see if my current kernel was compiled with PREEMPT:
[root@bigdog ~]# grep PREEMPT /boot/config-`uname -r`
# CONFIG_PREEMPT_RCU is not set
# CONFIG_PREEMPT_RCU_TRACE is not set
CONFIG_PREEMPT_NOTIFIERS=y
# CONFIG_PREEMPT_NONE is not set
CONFIG_PREEMPT_VOLUNTARY=y
# CONFIG_PREEMPT is not set
So, no, my kernel is not compiled with PREEMPT set.
----------------------------------------------------------------------
- Rick Stevens, Systems Engineer ricks@xxxxxxxx -
- AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 -
- -
- "How does that damned three seashell thing work?" -
- - Sylvester Stallone, "Demolition Man" -
----------------------------------------------------------------------
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