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Tue, 14 Apr 2026 08:23:17 +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 v5 14/14] selftests/mm: clarify alternate unmapping in compaction_test Date: Tue, 14 Apr 2026 13:52:08 +0530 Message-ID: <15427e424f95147b856474b77d9389b657ef0f7e.1776150071.git.sayalip@linux.ibm.com> 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-GUID: T0_jg1t3gdnF1lk-h5NiGazBt5I7iygi X-Proofpoint-Spam-Details-Enc: AW1haW4tMjYwNDE0MDA3NyBTYWx0ZWRfX/8eiTCjkRVf/ CDlXSF/ZHW+dMyylwuR+1pik44Rvj7wgiWN0W9/KY/FvEYaY62qX+UHtqi2i/prza03XH/cFMJS zG3yFDSp1XGkda7T+Kuj+Wf3XkAFmYoAE1BunLWfV9uQdKlQEshWJ75fny8wqf4cvgKDGdw1vQ3 KxvsjAYscOgrqodOvthZrG/MJfCoeVKpY34K01TrNxd2yMTb179LjECHU0CbmNyTP8zCwgqNY1f IApwLrAG10h2VS5hJZ97ai0Tor8T78cLnpTv+fqYoVFKVglfIVGx5Wcx8f6MzxLjVhZwNfVNHE+ 7ZPblCsZGIyaVy5XgIzdT27tXZE9rGnnOdwaycUm8WWcGaSC+moSDvUIGla5jkBPQwh1Lt3DdtZ NQOEI4FAMfYVnXhj+zgmJlC4VHlNdeW6RmHdXxZUNm0t2U6tIqtVQPxikusPav0a7R4B20aCA+J EUsF0s/TIEi8vppBesA== X-Proofpoint-ORIG-GUID: CaUNY_Bht_4C5dirHMU1MvsaTvVE0hDM X-Authority-Analysis: v=2.4 cv=FY4HAp+6 c=1 sm=1 tr=0 ts=69ddf97f cx=c_pps a=bLidbwmWQ0KltjZqbj+ezA==:117 a=bLidbwmWQ0KltjZqbj+ezA==:17 a=A5OVakUREuEA:10 a=VkNPw1HP01LnGYTKEx00:22 a=RnoormkPH1_aCDwRdu11:22 a=iQ6ETzBq9ecOQQE5vZCe: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=2026-04-14_02,2026-04-13_04,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 adultscore=0 priorityscore=1501 bulkscore=0 impostorscore=0 spamscore=0 lowpriorityscore=0 suspectscore=0 clxscore=1015 malwarescore=0 phishscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2604070000 definitions=main-2604140077 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 30209c40b697..e1610e2fbdf6 100644 --- a/tools/testing/selftests/mm/compaction_test.c +++ b/tools/testing/selftests/mm/compaction_test.c @@ -261,6 +261,9 @@ 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