On Tue, Sep 10, 2013 at 01:57:24PM -0500, Nathan Zimmer wrote: > From: Robin Holt <robin.m.holt@xxxxxxxxx> > > On large memory machines it can take a few minutes to get through > free_all_bootmem(). > > Currently, when free_all_bootmem() calls __free_pages_memory(), the > number of contiguous pages that __free_pages_memory() passes to the > buddy allocator is limited to BITS_PER_LONG. BITS_PER_LONG was originally > chosen to keep things similar to mm/nobootmem.c. But it is more > efficient to limit it to MAX_ORDER. > > base new change > 8TB 202s 172s 30s > 16TB 401s 351s 50s > > That is around 1%-3% improvement on total boot time. > > This patch was spun off from the boot time rfc Robin and I had been > working on. > > Signed-off-by: Robin Holt <robin.m.holt@xxxxxxxxx> > Signed-off-by: Nathan Zimmer <nzimmer@xxxxxxx> > To: "H. Peter Anvin" <hpa@xxxxxxxxx> > To: Ingo Molnar <mingo@xxxxxxxxxx> > Cc: Linux Kernel <linux-kernel@xxxxxxxxxxxxxxx> > Cc: Linux MM <linux-mm@xxxxxxxxx> > Cc: Rob Landley <rob@xxxxxxxxxxx> > Cc: Mike Travis <travis@xxxxxxx> > Cc: Daniel J Blueman <daniel@xxxxxxxxxxxxxxxxxx> > Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> > Cc: Greg KH <gregkh@xxxxxxxxxxxxxxxxxxx> > Cc: Yinghai Lu <yinghai@xxxxxxxxxx> > Cc: Mel Gorman <mgorman@xxxxxxx> Acked-by: Johannes Weiner <hannes@xxxxxxxxxxx> -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>