[PATCH 0/3] reduce readahead overheads on tmpfs mmap page faults

[Wu Fengguang]

Andrew,

This kills unnessesary ra->mmap_miss and ra->prev_pos updates on every page
fault when the readahead is disabled.

They fix the cache line bouncing problem in the mosbench exim benchmark, which
does multi-threaded page faults on shared struct file on tmpfs.

Thanks,
Fengguang

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