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eCQDBYC2FoVvqirH0UCqS2Dn6SXzoEYdA2+/z+IpTGsf2tgNhFZiOKLAQqgtfPyogkSeoQTEIk5 0BkXn6+JEDgZ/VVb/4MwiDK3JJ19FiNAgDwP53rr+WS3323BebG4xU9cAkspODR07GNYRK5uvR2 MhQ+RY74xKUs54K6+sNPOrFTetD7o0L16AhdyByqp5PQ4FtoVuuBBtGTI17LzOYkKG8vMCAykO0 GdDjML8v22LJn+vZn9nTGo2FhdHYp78ciSW1+pYBXmKoLHwkAYi7FSOCaaz+qzRP0maAvbwNRkm kWSVyB6aqmzXPal0FSTzlvNHULwbYoH28deGxJOHZO5rXWw+nKHahmOQQSsBfU2KftHz0a+H X-Proofpoint-ORIG-GUID: kQ2SArx_1JMgu3VMnMYqi185wR64usHm X-Authority-Analysis: v=2.4 cv=GsFC+l1C c=1 sm=1 tr=0 ts=682e1985 b=1 cx=c_pps a=WeWmnZmh0fydH62SvGsd2A==:117 a=WeWmnZmh0fydH62SvGsd2A==:17 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=wKuvFiaSGQ0qltdbU6+NXLB8nM8=:19 a=Ol13hO9ccFRV9qXi2t6ftBPywas=:19 a=xqWC_Br6kY4A:10 a=dt9VzEwgFbYA:10 a=GoEa3M9JfhUA:10 a=yPCof4ZbAAAA:8 a=WX__GcUTe9ZGzPOcXVoA:9 X-Proofpoint-GUID: kQ2SArx_1JMgu3VMnMYqi185wR64usHm Content-Type: text/plain; charset="utf-8" Add test to assert that we have now allowed merging of VMAs when KSM merging-by-default has been set by prctl(PR_SET_MEMORY_MERGE, ...). We simply perform a trivial mapping of adjacent VMAs expecting a merge, however prior to recent changes implementing this mode earlier than before, these merges would not have succeeded. Assert that we have fixed this! Signed-off-by: Lorenzo Stoakes Reviewed-by: Chengming Zhou Tested-by: Chengming Zhou Reviewed-by: Liam R. Howlett --- tools/testing/selftests/mm/merge.c | 78 ++++++++++++++++++++++++++++++ 1 file changed, 78 insertions(+) diff --git a/tools/testing/selftests/mm/merge.c b/tools/testing/selftests/m= m/merge.c index c76646cdf6e6..2380a5a6a529 100644 --- a/tools/testing/selftests/mm/merge.c +++ b/tools/testing/selftests/mm/merge.c @@ -2,10 +2,12 @@ =20 #define _GNU_SOURCE #include "../kselftest_harness.h" +#include #include #include #include #include +#include #include #include "vm_util.h" =20 @@ -31,6 +33,11 @@ FIXTURE_TEARDOWN(merge) { ASSERT_EQ(munmap(self->carveout, 12 * self->page_size), 0); ASSERT_EQ(close_procmap(&self->procmap), 0); + /* + * Clear unconditionally, as some tests set this. It is no issue if this + * fails (KSM may be disabled for instance). + */ + prctl(PR_SET_MEMORY_MERGE, 0, 0, 0, 0); } =20 TEST_F(merge, mprotect_unfaulted_left) @@ -452,4 +459,75 @@ TEST_F(merge, forked_source_vma) ASSERT_EQ(procmap->query.vma_end, (unsigned long)ptr2 + 5 * page_size); } =20 +TEST_F(merge, ksm_merge) +{ + unsigned int page_size =3D self->page_size; + char *carveout =3D self->carveout; + struct procmap_fd *procmap =3D &self->procmap; + char *ptr, *ptr2; + int err; + + /* + * Map two R/W immediately adjacent to one another, they should + * trivially merge: + * + * |-----------|-----------| + * | R/W | R/W | + * |-----------|-----------| + * ptr ptr2 + */ + + ptr =3D mmap(&carveout[page_size], page_size, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + ASSERT_NE(ptr, MAP_FAILED); + ptr2 =3D mmap(&carveout[2 * page_size], page_size, + PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + ASSERT_NE(ptr2, MAP_FAILED); + ASSERT_TRUE(find_vma_procmap(procmap, ptr)); + ASSERT_EQ(procmap->query.vma_start, (unsigned long)ptr); + ASSERT_EQ(procmap->query.vma_end, (unsigned long)ptr + 2 * page_size); + + /* Unmap the second half of this merged VMA. */ + ASSERT_EQ(munmap(ptr2, page_size), 0); + + /* OK, now enable global KSM merge. We clear this on test teardown. */ + err =3D prctl(PR_SET_MEMORY_MERGE, 1, 0, 0, 0); + if (err =3D=3D -1) { + int errnum =3D errno; + + /* Only non-failure case... */ + ASSERT_EQ(errnum, EINVAL); + /* ...but indicates we should skip. */ + SKIP(return, "KSM memory merging not supported, skipping."); + } + + /* + * Now map a VMA adjacent to the existing that was just made + * VM_MERGEABLE, this should merge as well. + */ + ptr2 =3D mmap(&carveout[2 * page_size], page_size, + PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + ASSERT_NE(ptr2, MAP_FAILED); + ASSERT_TRUE(find_vma_procmap(procmap, ptr)); + ASSERT_EQ(procmap->query.vma_start, (unsigned long)ptr); + ASSERT_EQ(procmap->query.vma_end, (unsigned long)ptr + 2 * page_size); + + /* Now this VMA altogether. */ + ASSERT_EQ(munmap(ptr, 2 * page_size), 0); + + /* Try the same operation as before, asserting this also merges fine. */ + ptr =3D mmap(&carveout[page_size], page_size, PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + ASSERT_NE(ptr, MAP_FAILED); + ptr2 =3D mmap(&carveout[2 * page_size], page_size, + PROT_READ | PROT_WRITE, + MAP_ANON | MAP_PRIVATE | MAP_FIXED, -1, 0); + ASSERT_NE(ptr2, MAP_FAILED); + ASSERT_TRUE(find_vma_procmap(procmap, ptr)); + ASSERT_EQ(procmap->query.vma_start, (unsigned long)ptr); + ASSERT_EQ(procmap->query.vma_end, (unsigned long)ptr + 2 * page_size); +} + TEST_HARNESS_MAIN --=20 2.49.0