Re: [LTP] [PATCH] cgroups: conditionally enable building cgroup tests

[Subrata Modak <subrata@linux.vnet.ibm.com>]

On Mon, 2009-07-06 at 14:42 +0200, Francesco RUNDO wrote:
> Hi Gowri,
> 
> thanks so much for your quick reply.
> My question is: "Is there a 'real' scenario in which cgroup is enabled 
> in the Kernel without cgroupstat.h header" ?
> 

Yes, there can be many situations.

> Because I think the above scenario (cgroup enabled but no cgroupstat.h 
> header) is wrong so that your patch provide a "cover" for an error 
> placed in the system. Is it true ?
> 

Say you have a older distro with kernel 2.6.18, where those stuff are
not there. Now, you have built kernel 2.6.30 on it with CGROUP enabled,
and booted in that kernel. So, your kernel is enabled with CGROUP, but
you may not have the user utilities like the libcgroup, etc. And until
you upgrade your system with latest glibc-headers or kernel-headers, any
build for userspace tools using CGROUP*.h fiel fail.

Regards--
Subrata

> If my understanding is wrong, for me there are no concerns about your patch.
> 
> Regards
> Francesco Rundo
> 
> gowrishankar wrote:
> 
> > Hi Francesco,
> >
> > Francesco RUNDO wrote:
> >
> >> Hi Gowri,
> >>
> >> I've already fixed the same issue you reported. I've tested it 
> >> successfully.
> >>
> >> Subrata has already merged my patch (please, find it in attachment).
> >>
> >> Please, check it before to submit another patch.
> >>
> >
> > I had already seen your patch and generated mine on top of Jun release 
> > (which
> > has your fix for CROSS_COMPILE).Your patch could not help in a 
> > scenario where kernel has cgroup support but cgroupstat.h file is 
> > missing in base OS, and
> > build failed. And hence, I am proposing this patch.
> >
> > Thanks,
> > Gowri
> >
> >> Thanks
> >> Regards
> >> Francesco Rundo
> >>
> >> gowrishankar wrote:
> >>
> >>> Hi Subrata,
> >>> Please accept the patch below.
> >>>
> >>> Thanks,
> >>> Gowri
> >>> ---
> >>> cgroups: conditionally enable building cgroup tests
> >>>
> >>> controllers tests gets included into default ltp build if 
> >>> "/proc/cgroup"
> >>> exists. It stops the ltp build in realtime kernel environment where 
> >>> kernel
> >>> is new and supports cgroups, but necessary file 
> >>> "linux/cgroupstats.h" may not
> >>> exist in the base OS (like RHEL5.3). So configure command enables 
> >>> the build,
> >>> but actual build fails, due to missing header file.
> >>>
> >>> Below patch proposes new symbol LTP_CHECK_CGROUPSTATS to check for 
> >>> header file
> >>> "linux/cgroupstats.h" and include controllers in the list of tests 
> >>> to build.
> >>>
> >>> Tested the patch in non-RT as well as RT environment for the changes.
> >>>
> >>> Signed-off-by: Gowrishankar <gowrishankar.m@in.ibm.com>
> >>> Tested-by: Gowrishankar <gowrishankar.m@in.ibm.com>
> >>> ---
> >>>
> >>> ------------------------------------------------------------------------ 
> >>>
> >>>
> >>> Index: ltp-full-20090630/m4/ltp-cgroupstats.m4
> >>> ===================================================================
> >>> --- /dev/null    1970-01-01 00:00:00.000000000 +0000
> >>> +++ ltp-full-20090630/m4/ltp-cgroupstats.m4    2009-07-03 
> >>> 13:41:55.000000000 +0530
> >>> @@ -0,0 +1,9 @@
> >>> +dnl
> >>> +dnl LTP_CHECK_CGROUPSTATS
> >>> +dnl ----------------------------
> >>> +dnl
> >>> +AC_DEFUN([LTP_CHECK_CGROUPSTATS],
> >>> +[dnl
> >>> +AC_CHECK_HEADERS(linux/cgroupstats.h,[LTP_CHECK_CGROUPSTATS_HEADER=yes]) 
> >>>
> >>> +AC_SUBST(LTP_CHECK_CGROUPSTATS_HEADER)
> >>> +])
> >>> Index: ltp-full-20090630/configure.ac
> >>> ===================================================================
> >>> --- ltp-full-20090630.orig/configure.ac    2009-07-03 
> >>> 13:59:48.000000000 +0530
> >>> +++ ltp-full-20090630/configure.ac    2009-07-03 14:00:14.000000000 
> >>> +0530
> >>> @@ -21,5 +21,6 @@
> >>>  LTP_CHECK_SELINUX
> >>>  LTP_CHECK_CRYPTO
> >>>  LTP_CHECK_TASKSTATS
> >>> +LTP_CHECK_CGROUPSTATS
> >>>
> >>>  AC_OUTPUT
> >>> Index: ltp-full-20090630/testcases/kernel/Makefile
> >>> ===================================================================
> >>> --- ltp-full-20090630.orig/testcases/kernel/Makefile    2009-07-03 
> >>> 14:01:25.000000000 +0530
> >>> +++ ltp-full-20090630/testcases/kernel/Makefile    2009-07-03 
> >>> 14:02:42.000000000 +0530
> >>> @@ -1,6 +1,12 @@
> >>> -SUBDIRS = power_management numa containers controllers connectors 
> >>> include fs io ipc mem pty sched security syscalls timers
> >>> +include ../../config.mk
> >>> +
> >>> +SUBDIRS = power_management numa containers connectors include fs io 
> >>> ipc mem pty sched security syscalls timers
> >>>  UCLINUX_SUBDIRS = include syscalls
> >>>
> >>> +ifeq ($(LTP_CHECK_CGROUPSTATS_HEADER),yes)
> >>> +    SUBDIRS+= controllers
> >>> +endif
> >>> +
> >>>  all:
> >>>      @set -e; for i in $(SUBDIRS); do $(MAKE) -C $$i ; done
> >>>
> >>>   
> >>> ------------------------------------------------------------------------ 
> >>>
> >>>
> >>> ------------------------------------------------------------------------------ 
> >>>
> >>>   
> >>> ------------------------------------------------------------------------ 
> >>>
> >>>
> >>> _______________________________________________
> >>> Ltp-list mailing list
> >>> Ltp-list@lists.sourceforge.net
> >>> https://lists.sourceforge.net/lists/listinfo/ltp-list
> >>>   
> >>
> >
> >
> 


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