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DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.dev; s=key1; t=1772105700; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=lZL1HqFM5fa36Uz0JOdbh5qV5iDmtrECipMEqRvI7/A=; b=bQvZ3Bk9zABmR2QjQC7aS7RsAH/+WnY/o7rjw0sMM8KWnVjY1pM/mPaqV2KVkr7y1+1yqV D95OAuC1N714g5HBViSG7olcJX86gP0ns8b9QPlaHVVrOOimKpItd/woUJYp5+xK0IrmW4 ebj/YYCu6frGA2CLRuuQD3QUhJIoTZs= From: Usama Arif To: Andrew Morton , david@kernel.org, lorenzo.stoakes@oracle.com, willy@infradead.org, linux-mm@kvack.org Cc: fvdl@google.com, hannes@cmpxchg.org, riel@surriel.com, shakeel.butt@linux.dev, kas@kernel.org, baohua@kernel.org, dev.jain@arm.com, baolin.wang@linux.alibaba.com, npache@redhat.com, Liam.Howlett@oracle.com, ryan.roberts@arm.com, Vlastimil Babka , lance.yang@linux.dev, linux-kernel@vger.kernel.org, kernel-team@meta.com, maddy@linux.ibm.com, mpe@ellerman.id.au, linuxppc-dev@lists.ozlabs.org, hca@linux.ibm.com, gor@linux.ibm.com, agordeev@linux.ibm.com, borntraeger@linux.ibm.com, svens@linux.ibm.com, linux-s390@vger.kernel.org, Usama Arif Subject: [RFC v2 19/21] selftests/mm: add partial_mlock test Date: Thu, 26 Feb 2026 03:23:48 -0800 Message-ID: <20260226113233.3987674-20-usama.arif@linux.dev> In-Reply-To: <20260226113233.3987674-1-usama.arif@linux.dev> References: <20260226113233.3987674-1-usama.arif@linux.dev> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Migadu-Flow: FLOW_OUT X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: C84E540008 X-Stat-Signature: hqe8o4txbcifjctndgu1gcft86d5q6ww X-HE-Tag: 1772105701-506037 X-HE-Meta: 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 LjUeuJgC dB2kYmip30augZHitexKbjWuJbv3Tifze7miwdmUsW/aoY2ymHsnRxXHoqE10lD/oakOntwMY0VfeOadB17vOtS97xWVjBnabn7hH4UR0xxFDkagQNNwyjM8zkE84lyhHuQpGePQKlY+TBd8E2UJyJG0pQNcCe56XYXoE3lr4GHNfXnVARgo+zHhOtXrUQJs9Gm2hWD6QVuC5Bw+LQTeu5rlXl8PhwQszx2PKQL+McpClohUVv1KIXfog7w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Add test for partial mlock on THP which exercises walk_page_range() with a subset of the THP. This should trigger a PMD split since mlock operates at page granularity. Signed-off-by: Usama Arif --- .../testing/selftests/mm/thp_pmd_split_test.c | 26 +++++++++++++++++++ 1 file changed, 26 insertions(+) diff --git a/tools/testing/selftests/mm/thp_pmd_split_test.c b/tools/testing/selftests/mm/thp_pmd_split_test.c index 4944a5a516da9..3c9f05457efec 100644 --- a/tools/testing/selftests/mm/thp_pmd_split_test.c +++ b/tools/testing/selftests/mm/thp_pmd_split_test.c @@ -177,4 +177,30 @@ TEST_F(thp_pmd_split, partial_mprotect) self->split_pmd_failed_before); } +/* + * Partial mlock triggering split (walk_page_range) + * + * Tests mlock on a partial THP region which should trigger a PMD split. + */ +TEST_F(thp_pmd_split, partial_mlock) +{ + int ret; + + ret = allocate_thp(self->aligned, self->pmdsize); + if (ret) + SKIP(return, "Failed to allocate THP"); + + /* Partial mlock - should trigger PMD split */ + ret = mlock((char *)self->aligned + self->pagesize, self->pagesize); + if (ret && errno == ENOMEM) + SKIP(return, "mlock failed with ENOMEM (resource limit)"); + ASSERT_EQ(ret, 0); + + /* Cleanup */ + munlock((char *)self->aligned + self->pagesize, self->pagesize); + + log_and_check_pmd_split(_metadata, self->split_pmd_before, + self->split_pmd_failed_before); +} + TEST_HARNESS_MAIN -- 2.47.3