[Bug 73831] New: xfs failed to allocate memory due to memory fragmentation

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https://bugzilla.kernel.org/show_bug.cgi?id=73831

            Bug ID: 73831
           Summary: xfs failed to allocate memory due to memory
                    fragmentation
           Product: File System
           Version: 2.5
    Kernel Version: 3.13.5
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: XFS
          Assignee: xfs-masters@xxxxxxxxxxx
          Reporter: yangzhe1990@xxxxxxxxx
        Regression: No

Hi,

We always experience web server hanging problem. xfs keeps printing 

XFS: possible memory allocation deadlock in kmem_alloc (mode:0x8250)

We finally find out that it's the memory fragmentation problem. We are
experiencing this problem even if we have 50% free memory (+ buffer/cache)
. echo 1 > /proc/sys/vm/drop_caches solve the problem instantly.

I was wondering if you could enhance the message, for example, print the amount
of pages being requested, and print messages like  

Node 0 Normal: 12544*4kB 68*8kB 0*16kB 0*32kB 0*64kB 0*128kB 0*256kB 0*512kB
0*1024kB 0*2048kB 1*4096kB = 54816kB

to help debugging, and try to allocate smaller number of pages.

Thanks.

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