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b5318d302f
Calling alloc_bootmem() for tiny chunks of memory over and over is really slow; on an XO-1, it caused the time between when the kernel started booting and when the display came alive (post-lxfb probe) to increase to 44s. This patch optimizes the prom_early_alloc function by calling alloc_bootmem for 4k-sized blocks of memory, and handing out chunks of that to callers. With this patch, the time between kernel load and display initialization decreased to 23s. If there's a better way to do this early in the boot process, please let me know. (Note: increasing the chunk size to 16k didn't noticably affect boot time, and wasted 9k.) v4: clarify comment, requested by hpa v3: fix wasted memory buglet found by Milton Miller, and style fix. v2: reorder prom_early_alloc as suggested by Grant. Signed-off-by: Andres Salomon <dilinger@queued.net> LKML-Reference: <20101129153951.74202a84@queued.net> Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> |
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