linux-kernel - Re: [PATCH -next v4 1/3] selftests/memory-hotplug: Add checking after online or offline

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Date:   Tue, 27 Sep 2022 11:56:14 +0000
From:   zhaogongyi <zhaogongyi@...wei.com>
To:     David Hildenbrand <david@...hat.com>,
        "linux-doc@...r.kernel.org" <linux-doc@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-mm@...ck.org" <linux-mm@...ck.org>,
        "linux-kselftest@...r.kernel.org" <linux-kselftest@...r.kernel.org>
CC:     "akinobu.mita@...il.com" <akinobu.mita@...il.com>,
        "corbet@....net" <corbet@....net>,
        "osalvador@...e.de" <osalvador@...e.de>,
        "shuah@...nel.org" <shuah@...nel.org>
Subject: Re: [PATCH -next v4 1/3] selftests/memory-hotplug: Add checking after
 online or offline

Hi!

> 
> On 27.09.22 05:28, Zhao Gongyi wrote:
> > Add checking for online_memory_expect_success()/
> > offline_memory_expect_success()/offline_memory_expect_fail(), or the
> > test would exit 0 although the functions return 1.
> >
> > Signed-off-by: Zhao Gongyi <zhaogongyi@...wei.com>
> > ---
> >   .../selftests/memory-hotplug/mem-on-off-test.sh      | 12
> +++++++++---
> >   1 file changed, 9 insertions(+), 3 deletions(-)
> >
> > diff --git a/tools/testing/selftests/memory-hotplug/mem-on-off-test.sh
> > b/tools/testing/selftests/memory-hotplug/mem-on-off-test.sh
> > index 46a97f318f58..1d87611a7d52 100755
> > --- a/tools/testing/selftests/memory-hotplug/mem-on-off-test.sh
> > +++ b/tools/testing/selftests/memory-hotplug/mem-on-off-test.sh
> > @@ -266,7 +266,9 @@ done
> >   #
> >   echo $error >
> $NOTIFIER_ERR_INJECT_DIR/actions/MEM_GOING_ONLINE/error
> >   for memory in `hotpluggable_offline_memory`; do
> > -	online_memory_expect_fail $memory
> > +	if ! online_memory_expect_fail $memory; then
> > +		retval=1
> > +	fi
> >   done
> >
> >   #
> > @@ -274,7 +276,9 @@ done
> >   #
> >   echo 0 >
> $NOTIFIER_ERR_INJECT_DIR/actions/MEM_GOING_ONLINE/error
> >   for memory in `hotpluggable_offline_memory`; do
> > -	online_memory_expect_success $memory
> > +	if ! online_memory_expect_success $memory; then
> > +		retval=1
> > +	fi
> >   done
> >
> >   #
> > @@ -283,7 +287,9 @@ done
> >   echo $error >
> $NOTIFIER_ERR_INJECT_DIR/actions/MEM_GOING_OFFLINE/error
> >   for memory in `hotpluggable_online_memory`; do
> >   	if [ $((RANDOM % 100)) -lt $ratio ]; then
> > -		offline_memory_expect_fail $memory
> > +		if ! offline_memory_expect_fail $memory; then
> > +			retval=1
> > +		fi
> >   	fi
> 
> 
> LGTM
> 
> Reviewed-by: David Hildenbrand <david@...hat.com>
> 
> 
> I am questioning the stability of the offlining test, though.
> Offlining a random memory block can fail easily, because "->removable" is not
> expressive:
> 
> # tools/testing/selftests/memory-hotplug/mem-on-off-test.sh
> Test scope: 2% hotplug memory
>           online all hot-pluggable memory in offline state:
>                   SKIPPED - no hot-pluggable memory in offline state
>           offline 2% hot-pluggable memory in online state
>           trying to offline 2 out of 96 memory block(s):
> online->offline memory0
> tools/testing/selftests/memory-hotplug/mem-on-off-test.sh: line 78: echo:
> write error: Invalid argument offline_memory_expect_success 0: unexpected
> fail
> online->offline memory10
> online->offline memory11
> 
> 
> I guess this test will almost always fail nowadays.

Offline some memory node maybe failed as expected, but the error message is a bit annoying.


> 
> --
> Thanks,
> 
> David / dhildenb