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b=qe5lO87NisfsM3iDtxIIwx2b6KsrsLiSJsPAjREU1YrMOzKrSA20KDolKjBRscKDXa IUUNmgJPUE5WFmHpBzRHJ4ulCk3Qll3YUApL2KTE6WPvA/8LbVxZ5OGH42sPi4xKqbNP yEmzB2EHMLRmH2yboxdx6STqc/xhxxbZJMvCWQb7B9UIXlkJhV12qeB5oP4kTXkkF/k4 xJWq51GcCr9Q7fBYhO8yi64A/kWsdLhmfGbnLWMvaWLp/WRCy4T7lc/vxJ0lwIhv9bRr YUIgwpr0ysOPdd838ILqvXO7B4OZIt24tQeuzzX59Ol9BYdUZ4qRVPAgn5FAiH43+gTO vDtw== X-Forwarded-Encrypted: i=1; AHgh+RpuomS+2I7mKM0NGJSN8aj/EPmK/R4y658cFARKN3DzpsXR6ksVGQzkqibvHKFUJWp3tUNoi6tsSg==@kvack.org X-Gm-Message-State: AOJu0YySQThFnROvAG5wIr8Ip/vBSHVpp19Js1Xbs+TMow6bwh1qY+db kPkYU7nbZTvObtVrOFLIZuyYo3y9FtmX0PEakVMuyIqkzlfFHA4HEejCfuBU+F+gpIRlkRgKatb GtaqPs6ZkVQJ4lA== X-Received: from dyjt7.prod.google.com ([2002:a05:7300:7b07:b0:311:7d79:c37f]) (user=jasonmiu job=prod-delivery.src-stubby-dispatcher) by 2002:a17:90b:4c8d:b0:38e:ad9d:1151 with SMTP id 98e67ed59e1d1-39580a4c6aamr4886911a91.4.1787123159758; Wed, 19 Aug 2026 00:05:59 -0700 (PDT) Date: Wed, 19 Aug 2026 00:05:38 -0700 In-Reply-To: <20260819070538.2404983-1-jasonmiu@google.com> Mime-Version: 1.0 References: <20260819070538.2404983-1-jasonmiu@google.com> X-Mailer: git-send-email 2.55.0.737.g08866a6d13-goog Message-ID: <20260819070538.2404983-4-jasonmiu@google.com> Subject: [PATCH 3/3] selftests: mm: add script for memory allocation stall test From: Jason Miu To: Andrew Morton , David Hildenbrand , Shuah Khan , David Rientjes , Shakeel Butt Cc: Lorenzo Stoakes , "Liam R . Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Greg Thelen , linux-kernel@vger.kernel.org, linux-mm@kvack.org, linux-kselftest@vger.kernel.org, Jason Miu Content-Type: text/plain; charset="UTF-8" X-Rspam-User: X-Stat-Signature: z9ymmckpdu7upf6b6xhx4nwpinwda186 X-Rspamd-Server: rspam09 X-Rspamd-Queue-Id: 14480160002 X-HE-Tag: 1787123160-780223 X-HE-Meta: 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 A9MAt7Pv 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 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Integrate page_alloc_stall.sh, a script to synchronize userspace and kernelspace workloads to reproduce page allocation stalls. Provision a synthetic loopback zswap block device, inject the test_mempress_timer.ko module to generate atomic page allocations inside kernel timers, and execute the page_alloc_stall_pressure.py payload to induce system-wide swap activity. Signed-off-by: Jason Miu --- .../testing/selftests/mm/page_alloc_stall.sh | 80 +++++++++++++++++++ 1 file changed, 80 insertions(+) create mode 100644 tools/testing/selftests/mm/page_alloc_stall.sh diff --git a/tools/testing/selftests/mm/page_alloc_stall.sh b/tools/testing/selftests/mm/page_alloc_stall.sh new file mode 100644 index 000000000000..3ece026fd680 --- /dev/null +++ b/tools/testing/selftests/mm/page_alloc_stall.sh @@ -0,0 +1,80 @@ +#!/bin/bash +# SPDX-License-Identifier: GPL-2.0 +# +# page_alloc_stall.sh +# +# Orchestrator script to generate concurrent userspace and kernelspace +# memory allocation pressure over a synthetic zswap backing block device +# to artificially induce systemic memory contention. +# +# Dependencies: +# - External memtoy binary (Source: https://github.com/kosaki/memtoy) +# +# Usage: +# ./page_alloc_stall.sh [hog_percent=80] [workers=64] [overcommit=2.5] \ +# [swap_gb=10%_RAM] [memtoy_path="memtoy/memtoy"] + +set -e + +SCRIPT_DIR=$(cd "$(dirname "$0")" && pwd) +PYTHON_CMD=${PYTHON_CMD:-python3} + +HOG_PERCENT=${1:-80} +NUM_WORKERS=${2:-64} +OVERCOMMIT=${3:-2.5} +TARGET_SWAP_GB=$4 +MEMTOY_PATH=${5:-"memtoy/memtoy"} + +function total_mem_gb() +{ + awk '/MemTotal/ {print int($2 / 1024 / 1024)}' /proc/meminfo +} + +function enable_zswap_file() +{ + local swap_size_gb=$1 + + fallocate -l ${swap_size_gb}G "$SCRIPT_DIR/swap.img" + + LOOP_DEV=$(losetup -f --show "$SCRIPT_DIR/swap.img") + mkswap $LOOP_DEV + swapon $LOOP_DEV + + echo 1 > /sys/module/zswap/parameters/enabled +} + +function cleanup() +{ + echo "Tearing down the test..." + if lsmod | grep -q test_mempress_timer; then + rmmod test_mempress_timer || echo "Failed to rmmod mempress_timer" + fi + + # Check if loop dev was actually created before trying to destroy it + if [ -n "$LOOP_DEV" ]; then + swapoff $LOOP_DEV 2>/dev/null || true + losetup -d $LOOP_DEV 2>/dev/null || true + fi + rm -f "$SCRIPT_DIR/swap.img" +} + +trap cleanup EXIT + +if [ -z "$TARGET_SWAP_GB" ]; then + # use 10% of the total mem for zswap file by default. + TARGET_SWAP_GB=$(($(total_mem_gb) / 10)) +fi + +enable_zswap_file $TARGET_SWAP_GB + +KROOT=$(cd "$SCRIPT_DIR/../../../.." && pwd) +KO_PATH="$KROOT/lib/test_mempress_timer.ko" + +if [ "$KO_PATH" ]; then + insmod "$KO_PATH" +else + echo "WARNING: $KO_PATH not found! Aborting the test." + exit 1 +fi + +"$PYTHON_CMD" "$SCRIPT_DIR/page_alloc_stall_pressure.py" $HOG_PERCENT $NUM_WORKERS $OVERCOMMIT $MEMTOY_PATH -- 2.55.0.691.gc56d675ccc-goog