mirror of
https://mirrors.bfsu.edu.cn/git/linux.git
synced 2025-01-07 06:14:24 +08:00
93fb70aa59
Patch series "mm/ksm: break_ksm() cleanups and fixes", v2. This series cleans up and fixes break_ksm(). In summary, we no longer use fake write faults to break COW but instead FAULT_FLAG_UNSHARE. Further, we move away from using follow_page() --- that we can hopefully remove completely at one point --- and use new walk_page_range_vma() instead. Fortunately, we can get rid of VM_FAULT_WRITE and FOLL_MIGRATION in common code now. Extend the existing ksm tests by an unmerge benchmark, and a some new unmerge tests. Also, add a selftest to measure MADV_UNMERGEABLE performance. In my setup (AMD Ryzen 9 3900X), running the KSM selftest to test unmerge performance on 2 GiB (taskset 0x8 ./ksm_tests -D -s 2048), this results in a performance degradation of ~6% -- 7% (old: ~5250 MiB/s, new: ~4900 MiB/s). I don't think we particularly care for now, but it's good to be aware of the implication. This patch (of 9): Let's add three unmerge tests (MADV_UNMERGEABLE unmerging all pages in the range). test_unmerge(): basic unmerge tests test_unmerge_discarded(): have some pte_none() entries in the range test_unmerge_uffd_wp(): protect the merged pages using uffd-wp ksm_tests.c currently contains a mixture of benchmarks and tests, whereby each test is carried out by executing the ksm_tests binary with specific parameters. Let's add new ksm_functional_tests.c that performs multiple, smaller functional tests all at once. Link: https://lkml.kernel.org/r/20221021101141.84170-1-david@redhat.com Link: https://lkml.kernel.org/r/20221021101141.84170-5-david@redhat.com Signed-off-by: David Hildenbrand <david@redhat.com> Cc: Andrea Arcangeli <aarcange@redhat.com> Cc: Hugh Dickins <hughd@google.com> Cc: Jason Gunthorpe <jgg@nvidia.com> Cc: John Hubbard <jhubbard@nvidia.com> Cc: Matthew Wilcox (Oracle) <willy@infradead.org> Cc: Peter Xu <peterx@redhat.com> Cc: Shuah Khan <shuah@kernel.org> Cc: Vlastimil Babka <vbabka@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> |
||
|---|---|---|
| .. | ||
| alsa | ||
| amd-pstate | ||
| arm64 | ||
| bpf | ||
| breakpoints | ||
| capabilities | ||
| cgroup | ||
| clone3 | ||
| core | ||
| cpu-hotplug | ||
| cpufreq | ||
| damon | ||
| dma | ||
| dmabuf-heaps | ||
| drivers | ||
| efivarfs | ||
| exec | ||
| filesystems | ||
| firmware | ||
| fpu | ||
| ftrace | ||
| futex | ||
| gpio | ||
| ia64 | ||
| intel_pstate | ||
| ipc | ||
| ir | ||
| kcmp | ||
| kexec | ||
| kmod | ||
| kselftest | ||
| kvm | ||
| landlock | ||
| lib | ||
| livepatch | ||
| lkdtm | ||
| locking | ||
| media_tests | ||
| membarrier | ||
| memfd | ||
| memory-hotplug | ||
| mincore | ||
| mount | ||
| mount_setattr | ||
| move_mount_set_group | ||
| mqueue | ||
| nci | ||
| net | ||
| netfilter | ||
| nolibc | ||
| nsfs | ||
| ntb | ||
| openat2 | ||
| perf_events | ||
| pid_namespace | ||
| pidfd | ||
| powerpc | ||
| prctl | ||
| proc | ||
| pstore | ||
| ptp | ||
| ptrace | ||
| rcutorture | ||
| resctrl | ||
| rlimits | ||
| rseq | ||
| rtc | ||
| safesetid | ||
| sched | ||
| seccomp | ||
| sgx | ||
| sigaltstack | ||
| size | ||
| sparc64 | ||
| splice | ||
| static_keys | ||
| sync | ||
| syscall_user_dispatch | ||
| sysctl | ||
| tc-testing | ||
| timens | ||
| timers | ||
| tmpfs | ||
| tpm2 | ||
| uevent | ||
| user | ||
| user_events | ||
| vDSO | ||
| vm | ||
| watchdog | ||
| wireguard | ||
| x86 | ||
| zram | ||
| .gitignore | ||
| gen_kselftest_tar.sh | ||
| kselftest_deps.sh | ||
| kselftest_harness.h | ||
| kselftest_install.sh | ||
| kselftest_module.h | ||
| kselftest.h | ||
| lib.mk | ||
| Makefile | ||
| run_kselftest.sh | ||