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| author | Andres Salomon <dilinger@queued.net> | 2010-11-30 00:39:51 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2010-12-16 02:11:40 +0100 |
| commit | b5318d302f8a20eacbbfc01b0ee35b108085a363 (patch) | |
| tree | d16b882c326cbe95fde6f3fb46b5e5b2b1b93d49 /arch/x86/include/asm/irq.h | |
| parent | x86, olpc: Add OLPC device-tree support (diff) | |
| download | linux-b5318d302f8a20eacbbfc01b0ee35b108085a363.tar.xz linux-b5318d302f8a20eacbbfc01b0ee35b108085a363.zip | |
x86, olpc: Speed up device tree creation during boot
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>
Diffstat (limited to 'arch/x86/include/asm/irq.h')
0 files changed, 0 insertions, 0 deletions