On Tue, Sep 10, 2013 at 01:57:24PM -0500, Nathan Zimmer wrote: > From: Robin Holt <[email protected]> > > 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 <[email protected]> > Signed-off-by: Nathan Zimmer <[email protected]> > To: "H. Peter Anvin" <[email protected]> > To: Ingo Molnar <[email protected]> > Cc: Linux Kernel <[email protected]> > Cc: Linux MM <[email protected]> > Cc: Rob Landley <[email protected]> > Cc: Mike Travis <[email protected]> > Cc: Daniel J Blueman <[email protected]> > Cc: Andrew Morton <[email protected]> > Cc: Greg KH <[email protected]> > Cc: Yinghai Lu <[email protected]> > Cc: Mel Gorman <[email protected]>
Acked-by: Johannes Weiner <[email protected]> -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
