Skip to main content

Browse the archive

https://github.com/torvalds/linux
23 October 2021, 00:29:24 UTC
Revision 701270fa193aadf00bdcf607738f64997275d4c7 authored by Hugh Dickins on 30 November 2018, 22:10:25 UTC, committed by Linus Torvalds on 30 November 2018, 22:56:15 UTC 
mm/khugepaged: collapse_shmem() stop if punched or truncated
 
Huge tmpfs testing showed that although collapse_shmem() recognizes a
concurrently truncated or hole-punched page correctly, its handling of
holes was liable to refill an emptied extent.  Add check to stop that.

Link: http://lkml.kernel.org/r/alpine.LSU.2.11.1811261522040.2275@eggly.anvils
Fixes: f3f0e1d2150b2 ("khugepaged: add support of collapse for tmpfs/shmem pages")
Signed-off-by: Hugh Dickins <hughd@google.com>
Reviewed-by: Matthew Wilcox <willy@infradead.org>
Cc: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
Cc: Jerome Glisse <jglisse@redhat.com>
Cc: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: <stable@vger.kernel.org>	[4.8+]
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent 006d3ff
Raw File
Tip revision: 701270fa193aadf00bdcf607738f64997275d4c7 authored by Hugh Dickins on 30 November 2018, 22:10:25 UTC
mm/khugepaged: collapse_shmem() stop if punched or truncated
Tip revision: 701270f
stackusage 
#!/bin/sh
# SPDX-License-Identifier: GPL-2.0

outfile=""
now=`date +%s`

while [ $# -gt 0 ]
do
    case "$1" in
        -o)
	    outfile="$2"
	    shift 2;;
	-h)
	    echo "usage: $0 [-o outfile] <make options/args>"
	    exit 0;;
	*)  break;;
    esac
done

if [ -z "$outfile" ]
then
    outfile=`mktemp --tmpdir stackusage.$$.XXXX`
fi

KCFLAGS="${KCFLAGS} -fstack-usage" make "$@"

# Prepend directory name to file names, remove column information,
# make file:line/function/size/type properly tab-separated.
find . -name '*.su' -newermt "@${now}" -print |                     \
    xargs perl -MFile::Basename -pe                                 \
        '$d = dirname($ARGV); s#([^:]+:[0-9]+):[0-9]+:#$d/$1\t#;' | \
    sort -k3,3nr > "${outfile}"

echo "$0: output written to ${outfile}"
back to top