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Howlett" , Vlastimil Babka , Mike Rapoport , Suren Baghdasaryan , Michal Hocko , Steven Rostedt , Masami Hiramatsu , Mathieu Desnoyers , Jann Horn , Pedro Falcato , linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, linux-doc@vger.kernel.org, linux-mm@kvack.org, linux-trace-kernel@vger.kernel.org, linux-kselftest@vger.kernel.org, Andrei Vagin Subject: [PATCH v2 4/5] tools/testing/vma: add VMA sticky userland tests Date: Thu, 6 Nov 2025 10:46:15 +0000 Message-ID: X-Mailer: git-send-email 2.51.0 In-Reply-To: References: Content-Transfer-Encoding: quoted-printable X-ClientProxiedBy: LO4P123CA0272.GBRP123.PROD.OUTLOOK.COM (2603:10a6:600:195::7) To DM4PR10MB8218.namprd10.prod.outlook.com (2603:10b6:8:1cc::16) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-MS-PublicTrafficType: Email X-MS-TrafficTypeDiagnostic: DM4PR10MB8218:EE_|IA3PR10MB8250:EE_ X-MS-Office365-Filtering-Correlation-Id: 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a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=6UeiqGixMTsA:10 a=GoEa3M9JfhUA:10 a=VkNPw1HP01LnGYTKEx00:22 a=yPCof4ZbAAAA:8 a=p333gLL91CABKhuAUmYA:9 X-Proofpoint-ORIG-GUID: L-h2x9YvZs8wqNRObk8qAg_QNIP6xtbm X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUxMTA1MDEwOSBTYWx0ZWRfX2hwHtMrjJDbj DW44m3XClSCZ/MwMu51Q3j34MSNIkiD35E08ndj5zSEh5JUqro6H3F0P2LrFknyKqXIB3mu8hdL 2/R8CiPtsTQu2S9GGlKrlFtdxU1xReM9ZzIwbWIMgZ49wm2NcjY6TP9TPdQ7FJwvNUix1IJTQzy TzY0SzguFirDY3EOwGpSEplUuUG0hjuKtsuRH8mu7Vn7u7SXzYLRR3on1XgPs6iHUcZPMg/7GnY JJoWmgUMw1N61fXAYUjzpyWabL557NRF7CnzCSKOzfJVT9+WscnXkxHo2ekFDtpk7CCW3RzQJJa czYyOIK4z35W1j6r7T/J1xlwVcReCm/p+sem7BhBSgFkyoir8a1f+p6d78YS+fIJIG741kAx7z1 PM2N95sDpomnZqIOYhhoImVLbfWY1g== X-Proofpoint-GUID: L-h2x9YvZs8wqNRObk8qAg_QNIP6xtbm Content-Type: text/plain; charset="utf-8" Modify existing merge new/existing userland VMA tests to assert that sticky VMA flags behave as expected. We do so by generating every possible permutation of VMAs being manipulated being sticky/not sticky and asserting that VMA flags with this property retain are retained upon merge. Signed-off-by: Lorenzo Stoakes --- tools/testing/vma/vma.c | 89 ++++++++++++++++++++++++++++++++++++----- 1 file changed, 79 insertions(+), 10 deletions(-) diff --git a/tools/testing/vma/vma.c b/tools/testing/vma/vma.c index 656e1c75b711..ee9d3547c421 100644 --- a/tools/testing/vma/vma.c +++ b/tools/testing/vma/vma.c @@ -48,6 +48,8 @@ static struct anon_vma dummy_anon_vma; #define ASSERT_EQ(_val1, _val2) ASSERT_TRUE((_val1) =3D=3D (_val2)) #define ASSERT_NE(_val1, _val2) ASSERT_TRUE((_val1) !=3D (_val2)) =20 +#define IS_SET(_val, _flags) ((_val & _flags) =3D=3D _flags) + static struct task_struct __current; =20 struct task_struct *get_current(void) @@ -441,7 +443,7 @@ static bool test_simple_shrink(void) return true; } =20 -static bool test_merge_new(void) +static bool __test_merge_new(bool is_sticky, bool a_is_sticky, bool b_is_s= ticky, bool c_is_sticky) { vm_flags_t vm_flags =3D VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE; struct mm_struct mm =3D {}; @@ -469,23 +471,32 @@ static bool test_merge_new(void) struct vm_area_struct *vma, *vma_a, *vma_b, *vma_c, *vma_d; bool merged; =20 + if (is_sticky) + vm_flags |=3D VM_STICKY; + /* * 0123456789abc * AA B CC */ vma_a =3D alloc_and_link_vma(&mm, 0, 0x2000, 0, vm_flags); ASSERT_NE(vma_a, NULL); + if (a_is_sticky) + vm_flags_set(vma_a, VM_STICKY); /* We give each VMA a single avc so we can test anon_vma duplication. */ INIT_LIST_HEAD(&vma_a->anon_vma_chain); list_add(&dummy_anon_vma_chain_a.same_vma, &vma_a->anon_vma_chain); =20 vma_b =3D alloc_and_link_vma(&mm, 0x3000, 0x4000, 3, vm_flags); ASSERT_NE(vma_b, NULL); + if (b_is_sticky) + vm_flags_set(vma_b, VM_STICKY); INIT_LIST_HEAD(&vma_b->anon_vma_chain); list_add(&dummy_anon_vma_chain_b.same_vma, &vma_b->anon_vma_chain); =20 vma_c =3D alloc_and_link_vma(&mm, 0xb000, 0xc000, 0xb, vm_flags); ASSERT_NE(vma_c, NULL); + if (c_is_sticky) + vm_flags_set(vma_c, VM_STICKY); INIT_LIST_HEAD(&vma_c->anon_vma_chain); list_add(&dummy_anon_vma_chain_c.same_vma, &vma_c->anon_vma_chain); =20 @@ -520,6 +531,8 @@ static bool test_merge_new(void) ASSERT_EQ(vma->anon_vma, &dummy_anon_vma); ASSERT_TRUE(vma_write_started(vma)); ASSERT_EQ(mm.map_count, 3); + if (is_sticky || a_is_sticky || b_is_sticky) + ASSERT_TRUE(IS_SET(vma->vm_flags, VM_STICKY)); =20 /* * Merge to PREVIOUS VMA. @@ -537,6 +550,8 @@ static bool test_merge_new(void) ASSERT_EQ(vma->anon_vma, &dummy_anon_vma); ASSERT_TRUE(vma_write_started(vma)); ASSERT_EQ(mm.map_count, 3); + if (is_sticky || a_is_sticky) + ASSERT_TRUE(IS_SET(vma->vm_flags, VM_STICKY)); =20 /* * Merge to NEXT VMA. @@ -556,6 +571,8 @@ static bool test_merge_new(void) ASSERT_EQ(vma->anon_vma, &dummy_anon_vma); ASSERT_TRUE(vma_write_started(vma)); ASSERT_EQ(mm.map_count, 3); + if (is_sticky) /* D uses is_sticky. */ + ASSERT_TRUE(IS_SET(vma->vm_flags, VM_STICKY)); =20 /* * Merge BOTH sides. @@ -574,6 +591,8 @@ static bool test_merge_new(void) ASSERT_EQ(vma->anon_vma, &dummy_anon_vma); ASSERT_TRUE(vma_write_started(vma)); ASSERT_EQ(mm.map_count, 2); + if (is_sticky || a_is_sticky) + ASSERT_TRUE(IS_SET(vma->vm_flags, VM_STICKY)); =20 /* * Merge to NEXT VMA. @@ -592,6 +611,8 @@ static bool test_merge_new(void) ASSERT_EQ(vma->anon_vma, &dummy_anon_vma); ASSERT_TRUE(vma_write_started(vma)); ASSERT_EQ(mm.map_count, 2); + if (is_sticky || c_is_sticky) + ASSERT_TRUE(IS_SET(vma->vm_flags, VM_STICKY)); =20 /* * Merge BOTH sides. @@ -609,6 +630,8 @@ static bool test_merge_new(void) ASSERT_EQ(vma->anon_vma, &dummy_anon_vma); ASSERT_TRUE(vma_write_started(vma)); ASSERT_EQ(mm.map_count, 1); + if (is_sticky || a_is_sticky || c_is_sticky) + ASSERT_TRUE(IS_SET(vma->vm_flags, VM_STICKY)); =20 /* * Final state. @@ -637,6 +660,20 @@ static bool test_merge_new(void) return true; } =20 +static bool test_merge_new(void) +{ + int i, j, k, l; + + /* Generate every possible permutation of sticky flags. */ + for (i =3D 0; i < 2; i++) + for (j =3D 0; j < 2; j++) + for (k =3D 0; k < 2; k++) + for (l =3D 0; l < 2; l++) + ASSERT_TRUE(__test_merge_new(i, j, k, l)); + + return true; +} + static bool test_vma_merge_special_flags(void) { vm_flags_t vm_flags =3D VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE; @@ -973,9 +1010,11 @@ static bool test_vma_merge_new_with_close(void) return true; } =20 -static bool test_merge_existing(void) +static bool __test_merge_existing(bool prev_is_sticky, bool middle_is_stic= ky, bool next_is_sticky) { vm_flags_t vm_flags =3D VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE; + vm_flags_t prev_flags =3D vm_flags; + vm_flags_t next_flags =3D vm_flags; struct mm_struct mm =3D {}; VMA_ITERATOR(vmi, &mm, 0); struct vm_area_struct *vma, *vma_prev, *vma_next; @@ -988,6 +1027,13 @@ static bool test_merge_existing(void) }; struct anon_vma_chain avc =3D {}; =20 + if (prev_is_sticky) + prev_flags |=3D VM_STICKY; + if (middle_is_sticky) + vm_flags |=3D VM_STICKY; + if (next_is_sticky) + next_flags |=3D VM_STICKY; + /* * Merge right case - partial span. * @@ -1000,7 +1046,7 @@ static bool test_merge_existing(void) */ vma =3D alloc_and_link_vma(&mm, 0x2000, 0x6000, 2, vm_flags); vma->vm_ops =3D &vm_ops; /* This should have no impact. */ - vma_next =3D alloc_and_link_vma(&mm, 0x6000, 0x9000, 6, vm_flags); + vma_next =3D alloc_and_link_vma(&mm, 0x6000, 0x9000, 6, next_flags); vma_next->vm_ops =3D &vm_ops; /* This should have no impact. */ vmg_set_range_anon_vma(&vmg, 0x3000, 0x6000, 3, vm_flags, &dummy_anon_vma= ); vmg.middle =3D vma; @@ -1018,6 +1064,8 @@ static bool test_merge_existing(void) ASSERT_TRUE(vma_write_started(vma)); ASSERT_TRUE(vma_write_started(vma_next)); ASSERT_EQ(mm.map_count, 2); + if (middle_is_sticky || next_is_sticky) + ASSERT_TRUE(IS_SET(vma_next->vm_flags, VM_STICKY)); =20 /* Clear down and reset. */ ASSERT_EQ(cleanup_mm(&mm, &vmi), 2); @@ -1033,7 +1081,7 @@ static bool test_merge_existing(void) * NNNNNNN */ vma =3D alloc_and_link_vma(&mm, 0x2000, 0x6000, 2, vm_flags); - vma_next =3D alloc_and_link_vma(&mm, 0x6000, 0x9000, 6, vm_flags); + vma_next =3D alloc_and_link_vma(&mm, 0x6000, 0x9000, 6, next_flags); vma_next->vm_ops =3D &vm_ops; /* This should have no impact. */ vmg_set_range_anon_vma(&vmg, 0x2000, 0x6000, 2, vm_flags, &dummy_anon_vma= ); vmg.middle =3D vma; @@ -1046,6 +1094,8 @@ static bool test_merge_existing(void) ASSERT_EQ(vma_next->anon_vma, &dummy_anon_vma); ASSERT_TRUE(vma_write_started(vma_next)); ASSERT_EQ(mm.map_count, 1); + if (middle_is_sticky || next_is_sticky) + ASSERT_TRUE(IS_SET(vma_next->vm_flags, VM_STICKY)); =20 /* Clear down and reset. We should have deleted vma. */ ASSERT_EQ(cleanup_mm(&mm, &vmi), 1); @@ -1060,7 +1110,7 @@ static bool test_merge_existing(void) * 0123456789 * PPPPPPV */ - vma_prev =3D alloc_and_link_vma(&mm, 0, 0x3000, 0, vm_flags); + vma_prev =3D alloc_and_link_vma(&mm, 0, 0x3000, 0, prev_flags); vma_prev->vm_ops =3D &vm_ops; /* This should have no impact. */ vma =3D alloc_and_link_vma(&mm, 0x3000, 0x7000, 3, vm_flags); vma->vm_ops =3D &vm_ops; /* This should have no impact. */ @@ -1080,6 +1130,8 @@ static bool test_merge_existing(void) ASSERT_TRUE(vma_write_started(vma_prev)); ASSERT_TRUE(vma_write_started(vma)); ASSERT_EQ(mm.map_count, 2); + if (prev_is_sticky || middle_is_sticky) + ASSERT_TRUE(IS_SET(vma_prev->vm_flags, VM_STICKY)); =20 /* Clear down and reset. */ ASSERT_EQ(cleanup_mm(&mm, &vmi), 2); @@ -1094,7 +1146,7 @@ static bool test_merge_existing(void) * 0123456789 * PPPPPPP */ - vma_prev =3D alloc_and_link_vma(&mm, 0, 0x3000, 0, vm_flags); + vma_prev =3D alloc_and_link_vma(&mm, 0, 0x3000, 0, prev_flags); vma_prev->vm_ops =3D &vm_ops; /* This should have no impact. */ vma =3D alloc_and_link_vma(&mm, 0x3000, 0x7000, 3, vm_flags); vmg_set_range_anon_vma(&vmg, 0x3000, 0x7000, 3, vm_flags, &dummy_anon_vma= ); @@ -1109,6 +1161,8 @@ static bool test_merge_existing(void) ASSERT_EQ(vma_prev->anon_vma, &dummy_anon_vma); ASSERT_TRUE(vma_write_started(vma_prev)); ASSERT_EQ(mm.map_count, 1); + if (prev_is_sticky || middle_is_sticky) + ASSERT_TRUE(IS_SET(vma_prev->vm_flags, VM_STICKY)); =20 /* Clear down and reset. We should have deleted vma. */ ASSERT_EQ(cleanup_mm(&mm, &vmi), 1); @@ -1123,10 +1177,10 @@ static bool test_merge_existing(void) * 0123456789 * PPPPPPPPPP */ - vma_prev =3D alloc_and_link_vma(&mm, 0, 0x3000, 0, vm_flags); + vma_prev =3D alloc_and_link_vma(&mm, 0, 0x3000, 0, prev_flags); vma_prev->vm_ops =3D &vm_ops; /* This should have no impact. */ vma =3D alloc_and_link_vma(&mm, 0x3000, 0x7000, 3, vm_flags); - vma_next =3D alloc_and_link_vma(&mm, 0x7000, 0x9000, 7, vm_flags); + vma_next =3D alloc_and_link_vma(&mm, 0x7000, 0x9000, 7, next_flags); vmg_set_range_anon_vma(&vmg, 0x3000, 0x7000, 3, vm_flags, &dummy_anon_vma= ); vmg.prev =3D vma_prev; vmg.middle =3D vma; @@ -1139,6 +1193,8 @@ static bool test_merge_existing(void) ASSERT_EQ(vma_prev->anon_vma, &dummy_anon_vma); ASSERT_TRUE(vma_write_started(vma_prev)); ASSERT_EQ(mm.map_count, 1); + if (prev_is_sticky || middle_is_sticky || next_is_sticky) + ASSERT_TRUE(IS_SET(vma_prev->vm_flags, VM_STICKY)); =20 /* Clear down and reset. We should have deleted prev and next. */ ASSERT_EQ(cleanup_mm(&mm, &vmi), 1); @@ -1158,9 +1214,9 @@ static bool test_merge_existing(void) * PPPVVVVVNNN */ =20 - vma_prev =3D alloc_and_link_vma(&mm, 0, 0x3000, 0, vm_flags); + vma_prev =3D alloc_and_link_vma(&mm, 0, 0x3000, 0, prev_flags); vma =3D alloc_and_link_vma(&mm, 0x3000, 0x8000, 3, vm_flags); - vma_next =3D alloc_and_link_vma(&mm, 0x8000, 0xa000, 8, vm_flags); + vma_next =3D alloc_and_link_vma(&mm, 0x8000, 0xa000, 8, next_flags); =20 vmg_set_range(&vmg, 0x4000, 0x5000, 4, vm_flags); vmg.prev =3D vma; @@ -1203,6 +1259,19 @@ static bool test_merge_existing(void) return true; } =20 +static bool test_merge_existing(void) +{ + int i, j, k; + + /* Generate every possible permutation of sticky flags. */ + for (i =3D 0; i < 2; i++) + for (j =3D 0; j < 2; j++) + for (k =3D 0; k < 2; k++) + ASSERT_TRUE(__test_merge_existing(i, j, k)); + + return true; +} + static bool test_anon_vma_non_mergeable(void) { vm_flags_t vm_flags =3D VM_READ | VM_WRITE | VM_MAYREAD | VM_MAYWRITE; --=20 2.51.0