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From: "Darrick J. Wong" <djwong@kernel.org>
To: Eryu Guan <guan@eryu.me>
Cc: guaneryu@gmail.com, linux-xfs@vger.kernel.org, fstests@vger.kernel.org
Subject: Re: [PATCH 1/3] generic: fsstress with cpu offlining
Date: Mon, 13 Sep 2021 11:25:28 -0700	[thread overview]
Message-ID: <20210913182528.GE638503@magnolia> (raw)
In-Reply-To: <YTTYr52ahATT74KK@desktop>

On Sun, Sep 05, 2021 at 10:48:15PM +0800, Eryu Guan wrote:
> On Tue, Aug 31, 2021 at 05:11:50PM -0700, Darrick J. Wong wrote:
> > From: Darrick J. Wong <djwong@kernel.org>
> > 
> > Exercise filesystem operations when we're taking CPUs online and offline
> > throughout the test.
> > 
> > Signed-off-by: Darrick J. Wong <djwong@kernel.org>
> > ---
> >  tests/generic/726     |   69 +++++++++++++++++++++++++++++++++++++++++++++++++
> >  tests/generic/726.out |    2 +
> >  2 files changed, 71 insertions(+)
> >  create mode 100755 tests/generic/726
> >  create mode 100644 tests/generic/726.out
> > 
> > 
> > diff --git a/tests/generic/726 b/tests/generic/726
> > new file mode 100755
> > index 00000000..cb709795
> > --- /dev/null
> > +++ b/tests/generic/726
> > @@ -0,0 +1,69 @@
> > +#! /bin/bash
> > +# SPDX-License-Identifier: GPL-2.0
> > +# Copyright (c) 2021 Oracle, Inc.  All Rights Reserved.
> > +#
> > +# FS QA Test No. 726
> > +#
> > +# Run an all-writes fsstress run with multiple threads while exercising CPU
> > +# hotplugging to shake out bugs in the write path.
> > +#
> > +. ./common/preamble
> > +_begin_fstest auto rw stress
> > +
> > +# Override the default cleanup function.
> > +_cleanup()
> > +{
> > +	cd /
> > +	rm -f $tmp.*
> > +	$KILLALL_PROG -9 fsstress > /dev/null 2>&1
> > +	wait	# for exercise_cpu_hotplug subprocess
> > +	for i in "$sysfs_cpu_dir/"cpu*/online; do
> > +		echo 1 > "$i" 2>/dev/null
> > +	done
> > +}
> > +
> > +exercise_cpu_hotplug()
> > +{
> > +	while [ -e $sentinel_file ]; do
> > +		local idx=$(( RANDOM % nr_hotplug_cpus ))
> > +		local cpu="${hotplug_cpus[idx]}"
> > +		local action=$(( RANDOM % 2 ))
> > +
> > +		echo "$action" > "$sysfs_cpu_dir/cpu$cpu/online" 2>/dev/null
> > +		sleep 0.5
> > +	done
> > +}
> > +
> > +_supported_fs generic
> > +
> > +sysfs_cpu_dir="/sys/devices/system/cpu"
> > +
> > +# Figure out which CPU(s) support hotplug.
> > +nrcpus=$(getconf _NPROCESSORS_CONF)
> > +hotplug_cpus=()
> > +for ((i = 0; i < nrcpus; i++ )); do
> > +	test -e "$sysfs_cpu_dir/cpu$i/online" && hotplug_cpus+=("$i")
> > +done
> > +nr_hotplug_cpus="${#hotplug_cpus[@]}"
> > +test "$nr_hotplug_cpus" -gt 0 || _notrun "CPU hotplugging not supported"
> > +
> > +_require_scratch
> > +_require_command "$KILLALL_PROG" "killall"
> > +
> > +echo "Silence is golden."
> > +
> > +_scratch_mkfs > $seqres.full 2>&1
> > +_scratch_mount >> $seqres.full 2>&1
> 
> I think we could just run fsstress against a dir in $TEST_DIR?

Ok.

> > +
> > +sentinel_file=$tmp.hotplug
> > +touch $sentinel_file
> > +exercise_cpu_hotplug &
> > +
> > +nr_cpus=$((LOAD_FACTOR * nr_hotplug_cpus))
> 
> We'd better to cap nr_cpu just in case we're testing on a system with
> 1024 cpus and taking very long time for fsstress to finish.

Not sure why that matters, but I'll cap the number of IO thread at one
per hotpluggable CPU if we go over 1024.

--D

> Thanks,
> Eryu
> 
> > +nr_ops=$((25000 * TIME_FACTOR))
> > +$FSSTRESS_PROG $FSSTRESS_AVOID -w -d $SCRATCH_MNT -n $nr_ops -p $nr_cpus >> $seqres.full
> > +rm -f $sentinel_file
> > +
> > +# success, all done
> > +status=0
> > +exit
> > diff --git a/tests/generic/726.out b/tests/generic/726.out
> > new file mode 100644
> > index 00000000..6839f8ce
> > --- /dev/null
> > +++ b/tests/generic/726.out
> > @@ -0,0 +1,2 @@
> > +QA output created by 726
> > +Silence is golden.
> > 

  reply	other threads:[~2021-09-13 18:25 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-09-01  0:11 [PATCHSET v2 0/3] fstests: exercise code refactored in 5.14 Darrick J. Wong
2021-09-01  0:11 ` [PATCH 1/3] generic: fsstress with cpu offlining Darrick J. Wong
2021-09-05 14:48   ` Eryu Guan
2021-09-13 18:25     ` Darrick J. Wong [this message]
2021-09-01  0:11 ` [PATCH 2/3] generic: test shutdowns of a nested filesystem Darrick J. Wong
2021-09-01  0:12 ` [PATCH 3/3] xfs/449: filter out deprecation warnings from mkfs Darrick J. Wong
2021-09-05 15:04 ` [PATCHSET v2 0/3] fstests: exercise code refactored in 5.14 Eryu Guan
2021-09-13 18:25   ` Darrick J. Wong

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