#
f8ee4361 |
|
11-Jan-2024 |
Muhammad Usama Anjum <usama.anjum@collabora.com> |
selftests/mm: mremap_test: fix build warning Use 2 separate variables of types int and unsigned long long instead of confusing them. This corrects the correct print format for each of them and removes the build warning: warning: format `%d' expects argument of type `int', but argument 2 has type `long long unsigned int' Link: https://lkml.kernel.org/r/20240112071851.612930-1-usama.anjum@collabora.com Fixes: a4cb3b243343 ("selftests: mm: add a test for remapping to area immediately after existing mapping") Signed-off-by: Muhammad Usama Anjum <usama.anjum@collabora.com> Cc: Joel Fernandes (Google) <joel@joelfernandes.org> Cc: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
#
d3772e7b |
|
13-Oct-2023 |
Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com> |
selftests/mm: Substitute attribute with a macro Compiling mm selftest after adding a __printf() attribute to ksft_print_msg() exposes -Wformat warning in remap_region(). Fix the wrong format specifier causing the warning. The mm selftest uses the printf attribute in its full form. Since the header file that uses it also includes kselftests.h it can use the macro defined there. Use __printf() included with kselftests.h instead of the full attribute. Signed-off-by: Maciej Wieczor-Retman <maciej.wieczor-retman@intel.com> Signed-off-by: Shuah Khan <skhan@linuxfoundation.org>
|
#
7b709f38 |
|
03-Sep-2023 |
Joel Fernandes <joel@joelfernandes.org> |
selftests: mm: add a test for moving from an offset from start of mapping It is possible that the aligned address falls on no existing mapping, however that does not mean that we can just align it down to that. This test verifies that the "vma->vm_start != addr_to_align" check in can_align_down() prevents disastrous results if aligning down when source and dest are mutually aligned within a PMD but the source/dest addresses requested are not at the beginning of the respective mapping containing these addresses. Link: https://lkml.kernel.org/r/20230903151328.2981432-8-joel@joelfernandes.org Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Lokesh Gidra <lokeshgidra@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
#
85a22845 |
|
03-Sep-2023 |
Joel Fernandes (Google) <joel@joelfernandes.org> |
selftests: mm: add a test for remapping within a range Move a block of memory within a memory range. Any alignment optimization on the source address may cause corruption. Verify using kselftest that it works. I have also verified with tracing that such optimization does not happen due to this check in can_align_down(): if (!for_stack && vma->vm_start != addr_to_align) return false; Link: https://lkml.kernel.org/r/20230903151328.2981432-7-joel@joelfernandes.org Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Lokesh Gidra <lokeshgidra@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
#
a4cb3b24 |
|
03-Sep-2023 |
Joel Fernandes (Google) <joel@joelfernandes.org> |
selftests: mm: add a test for remapping to area immediately after existing mapping This patch adds support for verifying that we correctly handle the situation where something is already mapped before the destination of the remap. Any realignment of destination address and PMD-copy will destroy that existing mapping. In such cases, we need to avoid doing the optimization. To test this, we map an area called the preamble before the remap region. Then we verify after the mremap operation that this region did not get corrupted. Putting some prints in the kernel, I verified that we optimize correctly in different situations: Optimize when there is alignment and no previous mapping (this is tested by previous patch). <prints> can_align_down(old_vma->vm_start=2900000, old_addr=2900000, mask=-2097152): 0 can_align_down(new_vma->vm_start=2f00000, new_addr=2f00000, mask=-2097152): 0 === Starting move_page_tables === Doing PUD move for 2800000 -> 2e00000 of extent=200000 <-- Optimization Doing PUD move for 2a00000 -> 3000000 of extent=200000 Doing PUD move for 2c00000 -> 3200000 of extent=200000 </prints> Don't optimize when there is alignment but there is previous mapping (this is tested by this patch). Notice that can_align_down() returns 1 for the destination mapping as we detected there is something there. <prints> can_align_down(old_vma->vm_start=2900000, old_addr=2900000, mask=-2097152): 0 can_align_down(new_vma->vm_start=5700000, new_addr=5700000, mask=-2097152): 1 === Starting move_page_tables === Doing move_ptes for 2900000 -> 5700000 of extent=100000 <-- Unoptimized Doing PUD move for 2a00000 -> 5800000 of extent=200000 Doing PUD move for 2c00000 -> 5a00000 of extent=200000 </prints> Link: https://lkml.kernel.org/r/20230903151328.2981432-6-joel@joelfernandes.org Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Lokesh Gidra <lokeshgidra@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
#
8ed873d8 |
|
03-Sep-2023 |
Joel Fernandes (Google) <joel@joelfernandes.org> |
selftests: mm: add a test for mutually aligned moves > PMD size This patch adds a test case to check if a PMD-alignment optimization successfully happens. I add support to make sure there is some room before the source mapping, otherwise the optimization to trigger PMD-aligned move will be disabled as the kernel will detect that a mapping before the source exists and such optimization becomes impossible. Link: https://lkml.kernel.org/r/20230903151328.2981432-5-joel@joelfernandes.org Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Lokesh Gidra <lokeshgidra@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
#
99eb26d5 |
|
03-Sep-2023 |
Joel Fernandes (Google) <joel@joelfernandes.org> |
selftests: mm: fix failure case when new remap region was not found When a valid remap region could not be found, the source mapping is not cleaned up. Fix the goto statement such that the clean up happens. Link: https://lkml.kernel.org/r/20230903151328.2981432-4-joel@joelfernandes.org Signed-off-by: Joel Fernandes (Google) <joel@joelfernandes.org> Reviewed-by: Lorenzo Stoakes <lstoakes@gmail.com> Cc: Kalesh Singh <kaleshsingh@google.com> Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Liam R. Howlett <Liam.Howlett@oracle.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Lokesh Gidra <lokeshgidra@google.com> Cc: Michal Hocko <mhocko@suse.com> Cc: Paul E. McKenney <paulmck@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Suren Baghdasaryan <surenb@google.com> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
#
da0618c1 |
|
02-Jan-2023 |
Lorenzo Stoakes <lstoakes@gmail.com> |
selftest/vm: add mremap expand merge offset test Add a test to assert that we can mremap() and expand a mapping starting from an offset within an existing mapping. We unmap the last page in a 3 page mapping to ensure that the remap should always succeed, before remapping from the 2nd page. This is additionally a regression test for the issue solved in "mm, mremap: fix mremap() expanding vma with addr inside vma" and confirmed to fail prior to the change and pass after it. Finally, this patch updates the existing mremap expand merge test to check error conditions and reduce code duplication between the two tests. [lstoakes@gmail.com: increment num_expand_tests so test doesn't complain about unexpected tests being run] Link: https://lkml.kernel.org/r/8ff3ba3cadc0b6c1b2688ae5c851bf73aa062d57.1673701836.git.lstoakes@gmail.com Link: https://lkml.kernel.org/r/02b117a8ffd52acc01dc66c2fb39754f08d92c0e.1672675824.git.lstoakes@gmail.com Signed-off-by: Lorenzo Stoakes <lstoakes@gmail.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Jakub Matěna <matenajakub@gmail.com> Cc: Matthew Wilcox <willy@infradead.org> Cc: Mel Gorman <mgorman@techsingularity.net> Cc: Michal Hocko <mhocko@kernel.org> Cc: Shuah Khan <shuah@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|
#
baa489fa |
|
03-Jan-2023 |
SeongJae Park <sj@kernel.org> |
selftests/vm: rename selftests/vm to selftests/mm Rename selftets/vm to selftests/mm for being more consistent with the code, documentation, and tools directories, and won't be confused with virtual machines. [sj@kernel.org: convert missing vm->mm changes] Link: https://lkml.kernel.org/r/20230107230643.252273-1-sj@kernel.org Link: https://lkml.kernel.org/r/20230103180754.129637-5-sj@kernel.org Signed-off-by: SeongJae Park <sj@kernel.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Shuah Khan <shuah@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
|