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    SubjectRe: nfs unhappiness with memory pressure
    --- Keith Mannthey <kmannth@gmail.com> wrote:
    > You are still reporing free pages. Do you seen the OOM killer killing
    > processes?

    Running the test with /proc/sys/vm/overcommit_memory = 2, I get a similar
    result. It still hangs after about 5.9GB, but it starts trying to write
    out the file sooner.
    Here is the stack trace I have for the process (again, by hand, what didn't scroll by as nothing
    makes it to logs...)

    writetest:
    schedule_timeout
    io_schedule_timeout
    blk_congestion_wait
    throttle_vm_writeout
    shrink_zone
    shrink_caches
    try_to_free_pages
    __alloc_pages
    -> (up to here it matches the previous run's stack from rpciod/0)
    kmem_getpages
    cache_grow
    cache_alloc_refill
    kmem_cache_alloc
    mempool_alloc_slab
    mempool_alloc
    nfs_flush_one
    nfs_flush_list
    nfs_flush_inode
    nfs_write_pages
    do_writepages
    __filemap_fdatawrite_range
    filemap_fdatawrite
    filemap_write_and_wait
    nfs_revalidate_mapping
    nfs_file_write
    do_sync_write
    vfs_write
    sys_pwrite64

    The memory dump showed there was memory still available, with no swap in use.

    -Kenny





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