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"page allocation failure" メッセージの各項目が示すものは何ですか?

Solution Verified - Updated -

Issue

/var/log/messages ファイルに、ページの割り当てに失敗したことを示すメッセージと、スタックトレースが示されます。"page allocation failure" 行の各項目が示すものは何ですか?

例:

kernel: swapper: page allocation failure. order:2, mode:0x20
kernel:Pid:0, comm: swapper Not tainted 2.6.32-220.4.1.el6.x86_64 #1
kernel:Call Trace:
kernel:<IRQ>  [<ffffffff81123daf>] ?__alloc_pages_nodemask+0x77f/0x940
kernel:[<ffffffff8115dc62>] ? kmem_getpages+0x62/0x170
kernel:[<ffffffff8115e87a>] ? fallback_alloc+0x1ba/0x270
kernel:[<ffffffff8115e2cf>] ? cache_grow+0x2cf/0x320
kernel:[<ffffffff8115e5f9>] ?____cache_alloc_node+0x99/0x160
...

Environment

Red Hat Enterprise Linux 6

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