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X-MS-Exchange-AntiSpam-MessageData-ChunkCount: 1 X-MS-Exchange-AntiSpam-MessageData-0: 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 X-OriginatorOrg: Nvidia.com X-MS-Exchange-CrossTenant-Network-Message-Id: cf177e44-39b7-46e1-21b4-08da9547e9af X-MS-Exchange-CrossTenant-AuthSource: BYAPR12MB3176.namprd12.prod.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Internal X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Sep 2022 05:22:12.3538 (UTC) X-MS-Exchange-CrossTenant-FromEntityHeader: Hosted X-MS-Exchange-CrossTenant-Id: 43083d15-7273-40c1-b7db-39efd9ccc17a X-MS-Exchange-CrossTenant-MailboxType: HOSTED X-MS-Exchange-CrossTenant-UserPrincipalName: 6EKuWki1n+hThDMmqYPn72Q+MBEZ6wqHbMNZANFjU9+/RkzDq7y2kEh7esJFKOeTOzjY4opK7sEMTMGIQu8FRg== X-MS-Exchange-Transport-CrossTenantHeadersStamped: SN7PR12MB6692 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Sierra Guiza, Alejandro \(Alex\)" , Nadav Amit , Alistair Popple , Lyude Paul , Karol Herbst , David Hildenbrand , John Hubbard , Felix Kuehling , linuxppc-dev@lists.ozlabs.org, LKML , Peter Xu , Logan Gunthorpe , Ralph Campbell , Matthew Wilcox , Jason Gunthorpe , huang ying , Ben Skeggs Errors-To: linuxppc-dev-bounces+incoming=patchwork.ozlabs.org@lists.ozlabs.org Sender: "Linuxppc-dev" As noted by John Hubbard the original test relied on side effects of the implementation of migrate_vma_setup() to detect if pages had been swapped to disk or not. This is subject to change in future so explicitly check for swap entries via pagemap instead. Fix a spelling mistake while we're at it. Signed-off-by: Alistair Popple Fixes: 5cc88e844e87 ("selftests/hmm-tests: add test for dirty bits") Reviewed-by: Mika Penttilä --- tools/testing/selftests/vm/hmm-tests.c | 50 +++++++++++++++++++++++--- 1 file changed, 46 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/vm/hmm-tests.c b/tools/testing/selftests/vm/hmm-tests.c index 70fdb49b59ed..b5f6a7dc1f12 100644 --- a/tools/testing/selftests/vm/hmm-tests.c +++ b/tools/testing/selftests/vm/hmm-tests.c @@ -1261,9 +1261,47 @@ static int destroy_cgroup(void) return 0; } +static uint64_t get_pfn(int fd, uint64_t ptr) +{ + uint64_t pfn; + int ret; + + ret = pread(fd, &pfn, sizeof(ptr), + (uint64_t) ptr / getpagesize() * sizeof(ptr)); + if (ret != sizeof(ptr)) + return 0; + + return pfn; +} + +#define PAGEMAP_SWAPPED (1ULL << 62) + +/* Returns true if at least one page in the range is on swap */ +static bool pages_swapped(void *ptr, unsigned long pages) +{ + uint64_t pfn; + int fd = open("/proc/self/pagemap", O_RDONLY); + unsigned long i; + + if (fd < 0) + return false; + + for (i = 0; i < pages; i++) { + pfn = get_pfn(fd, (uint64_t) ptr + i * getpagesize()); + + if (pfn & PAGEMAP_SWAPPED) { + close(fd); + return true; + } + } + + close(fd); + return false; +} + /* * Try and migrate a dirty page that has previously been swapped to disk. This - * checks that we don't loose dirty bits. + * checks that we don't lose dirty bits. */ TEST_F(hmm, migrate_dirty_page) { @@ -1300,6 +1338,10 @@ TEST_F(hmm, migrate_dirty_page) ASSERT_FALSE(write_cgroup_param(cgroup, "memory.reclaim", 1UL<<30)); + /* Make sure at least some pages got paged to disk. */ + if (!pages_swapped(buffer->ptr, npages)) + SKIP(return, "Pages weren't swapped when they should have been"); + /* Fault pages back in from swap as clean pages */ for (i = 0, ptr = buffer->ptr; i < size / sizeof(*ptr); ++i) tmp += ptr[i]; @@ -1309,10 +1351,10 @@ TEST_F(hmm, migrate_dirty_page) ptr[i] = i; /* - * Attempt to migrate memory to device, which should fail because - * hopefully some pages are backed by swap storage. + * Attempt to migrate memory to device. This might fail if some pages + * are/were backed by swap but that's ok. */ - ASSERT_TRUE(hmm_migrate_sys_to_dev(self->fd, buffer, npages)); + hmm_migrate_sys_to_dev(self->fd, buffer, npages); ASSERT_FALSE(write_cgroup_param(cgroup, "memory.reclaim", 1UL<<30));