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    perf_event: Provide vmalloc() based mmap() backing · 906010b2
    Peter Zijlstra 提交于
    Some architectures such as Sparc, ARM and MIPS (basically
    everything with flush_dcache_page()) need to deal with dcache
    aliases by carefully placing pages in both kernel and user maps.
    
    These architectures typically have to use vmalloc_user() for this.
    
    However, on other architectures, vmalloc() is not needed and has
    the downsides of being more restricted and slower than regular
    allocations.
    Signed-off-by: NPeter Zijlstra <a.p.zijlstra@chello.nl>
    Acked-by: NDavid Miller <davem@davemloft.net>
    Cc: Andrew Morton <akpm@linux-foundation.org>
    Cc: Jens Axboe <jens.axboe@oracle.com>
    Cc: Paul Mackerras <paulus@samba.org>
    LKML-Reference: <1254830228.21044.272.camel@laptop>
    Signed-off-by: NIngo Molnar <mingo@elte.hu>
    906010b2
perf_event.c 115.7 KB