Messages in this thread | | | Date | Mon, 20 Jul 2020 10:27:10 +0200 | From | osalvador@suse ... | Subject | Re: [PATCH v4 12/15] mm,hwpoison: Rework soft offline for in-use pages |
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On 2020-07-17 08:55, HORIGUCHI NAOYA wrote: > I ran Quan Cai's test program (https://github.com/cailca/linux-mm) on a > small (4GB memory) VM, and weiredly found that (1) the target hugepages > are not always dissolved and (2) dissovled hugetpages are still counted > in "HugePages_Total:". See below: > > $ ./random 1 > - start: migrate_huge_offline > - use NUMA nodes 0,1. > - mmap and free 8388608 bytes hugepages on node 0 > - mmap and free 8388608 bytes hugepages on node 1 > madvise: Cannot allocate memory > > $ cat /proc/meminfo > MemTotal: 4026772 kB > MemFree: 976300 kB > MemAvailable: 892840 kB > Buffers: 20936 kB > Cached: 99768 kB > SwapCached: 5904 kB > Active: 84332 kB > Inactive: 116328 kB > Active(anon): 27944 kB > Inactive(anon): 68524 kB > Active(file): 56388 kB > Inactive(file): 47804 kB > Unevictable: 7532 kB > Mlocked: 0 kB > SwapTotal: 2621436 kB > SwapFree: 2609844 kB > Dirty: 56 kB > Writeback: 0 kB > AnonPages: 81764 kB > Mapped: 54348 kB > Shmem: 8948 kB > KReclaimable: 22744 kB > Slab: 52056 kB > SReclaimable: 22744 kB > SUnreclaim: 29312 kB > KernelStack: 3888 kB > PageTables: 2804 kB > NFS_Unstable: 0 kB > Bounce: 0 kB > WritebackTmp: 0 kB > CommitLimit: 3260612 kB > Committed_AS: 828196 kB > VmallocTotal: 34359738367 kB > VmallocUsed: 19260 kB > VmallocChunk: 0 kB > Percpu: 5120 kB > HardwareCorrupted: 5368 kB > AnonHugePages: 18432 kB > ShmemHugePages: 0 kB > ShmemPmdMapped: 0 kB > FileHugePages: 0 kB > FilePmdMapped: 0 kB > CmaTotal: 0 kB > CmaFree: 0 kB > HugePages_Total: 1342 // still counted as hugetlb pages. > HugePages_Free: 0 // all hugepage are still allocated > (or leaked?) > HugePages_Rsvd: 0 > HugePages_Surp: 762 // some are counted in surplus. > Hugepagesize: 2048 kB > Hugetlb: 2748416 kB > DirectMap4k: 112480 kB > DirectMap2M: 4081664 kB > > > $ page-types -b hwpoison > flags page-count MB symbolic-flags > long-symbolic-flags > 0x0000000000080008 421 1 > ___U_______________X_______________________ uptodate,hwpoison > 0x00000000000a8018 1 0 > ___UD__________H_G_X_______________________ > uptodate,dirty,compound_head,huge,hwpoison > 0x00000000000a801c 920 3 > __RUD__________H_G_X_______________________ > referenced,uptodate,dirty,compound_head,huge,hwpoison > total 1342 5 > > This means that some hugepages are dissolved, but the others not, > maybe which is not desirable. > I'll dig this more later but just let me share at first. > > A few minor comment below ...
Uhm, weird.
I will be taking a look today.
Thanks
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