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Thu, 21 May 2026 06:48:32 +0000 (GMT) Received: from li-3f69264c-2ce6-11b2-a85c-c3f414d24014.bl1-in.ibm.com (unknown [9.123.3.209]) by smtpav01.fra02v.mail.ibm.com (Postfix) with ESMTP; Thu, 21 May 2026 06:48:32 +0000 (GMT) From: Sayali Patil To: Andrew Morton , Shuah Khan , linux-mm@kvack.org, linux-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Ritesh Harjani Cc: David Hildenbrand , Zi Yan , Michal Hocko , Oscar Salvador , Lorenzo Stoakes , Dev Jain , Liam.Howlett@oracle.com, linuxppc-dev@lists.ozlabs.org, Miaohe Lin , Venkat Rao Bagalkote , Sayali Patil Subject: [PATCH v7 13/13] selftests/mm: clarify alternate unmapping in compaction_test Date: Thu, 21 May 2026 12:17:53 +0530 Message-ID: X-Mailer: git-send-email 2.52.0 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Reinject: loops=2 maxloops=12 X-Proofpoint-ORIG-GUID: 1pF53W5BIdKYW_lxTRZ2eoamRBw1P_PD X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNTIxMDA2MiBTYWx0ZWRfX06tcHDJDJrMG YTFU4A6E26qTAclF1E1qDWHIUoF9KXE8DEwb/pMYeYuOeVyLcCLybY1x5fGVUCSim145a1mlZD8 GfjwxHYaqL2E4zu6APXvFl4rvBOA4ziF4hAXjNex9HYZzny/0JqUC1PI96EWVlUyuKLm31amdnI MLDCNdnJjFQHS0LKK48qb2Dd68yCdxjC+F4RQKg0JSs8vmfAv4i8vu8tAjmIQSKfFVEKgZt/eLp dBsWKBBBd9hmQJWBqYYvbLFiIIFWI+sIwZ446xwW4jiiBje7q3NqOsvfCRDAjbjZ8Nsn3EUT+v9 WweWPONzdSF+DHLTri2ON7OuR2cTZM2OYVnLtvEAheoLqsxAGp93I3rwBgT/CwEjjEEEuEHL4eW C/NbNTJmy0naTFHV6RSZI0FYgik0rTGbFyzXyKpTWjNMbPZ3oL21U0f1bdxNmbr9FGAoZkH1xEw 35JkQVNyzF1ljtxr0CA== X-Proofpoint-GUID: ypZ8jMGmHbV48Chdn4zcz8L_7sFw0qly X-Authority-Analysis: v=2.4 cv=apyCzyZV c=1 sm=1 tr=0 ts=6a0eaac8 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=NGcC8JguVDcA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=V8glGbnc2Ofi9Qvn3v5h:22 a=VnNF1IyMAAAA:8 a=THlBPJCoSQ4NST9nLWYA:9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1143,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-05-20_03,2026-05-18_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 impostorscore=0 bulkscore=0 suspectscore=0 adultscore=0 spamscore=0 phishscore=0 clxscore=1015 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2605130000 definitions=main-2605210062 Add a comment explaining that every other entry in the list is unmapped to intentionally create fragmentation with locked pages before invoking check_compaction(). Fixes: bd67d5c15cc1 ("Test compaction of mlocked memory") Tested-by: Venkat Rao Bagalkote Signed-off-by: Sayali Patil --- tools/testing/selftests/mm/compaction_test.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/tools/testing/selftests/mm/compaction_test.c b/tools/testing/selftests/mm/compaction_test.c index de0633f9a7e5..5b582588e015 100644 --- a/tools/testing/selftests/mm/compaction_test.c +++ b/tools/testing/selftests/mm/compaction_test.c @@ -181,6 +181,9 @@ int main(int argc, char **argv) mem_fragmentable_MB -= MAP_SIZE_MB; } + /* Unmap every other entry in the list to create fragmentation with + * locked pages before invoking check_compaction(). + */ for (entry = list; entry != NULL; entry = entry->next) { munmap(entry->map, MAP_SIZE); if (!entry->next) -- 2.52.0