What are .config parameters for my kernel?
Rick Stevens
ricks at nerd.com
Thu Oct 29 19:14:35 UTC 2009
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 at 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 at nerd.com -
- AIM/Skype: therps2 ICQ: 22643734 Yahoo: origrps2 -
- -
- "How does that damned three seashell thing work?" -
- - Sylvester Stallone, "Demolition Man" -
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