On 03/24/2017 12:01 AM, Pavel Tatashin wrote: > When deferred struct page initialization feature is enabled, we get a > performance gain of initializing vmemmap in parallel after other CPUs are > started. However, we still zero the memory for vmemmap using one boot CPU. > This patch-set fixes the memset-zeroing limitation by deferring it as well. > > Here is example performance gain on SPARC with 32T: > base > https://hastebin.com/ozanelatat.go > > fix > https://hastebin.com/utonawukof.go > > As you can see without the fix it takes: 97.89s to boot > With the fix it takes: 46.91 to boot. > > On x86 time saving is going to be even greater (proportionally to memory size) > because there are twice as many "struct page"es for the same amount of memory, > as base pages are twice smaller. Fixing the linux-s390 mailing list email. This might be useful for s390 as well. > > > Pavel Tatashin (5): > sparc64: simplify vmemmap_populate > mm: defining memblock_virt_alloc_try_nid_raw > mm: add "zero" argument to vmemmap allocators > mm: zero struct pages during initialization > mm: teach platforms not to zero struct pages memory > > arch/powerpc/mm/init_64.c | 4 +- > arch/s390/mm/vmem.c | 5 ++- > arch/sparc/mm/init_64.c | 26 +++++++---------------- > arch/x86/mm/init_64.c | 3 +- > include/linux/bootmem.h | 3 ++ > include/linux/mm.h | 15 +++++++++++-- > mm/memblock.c | 46 ++++++++++++++++++++++++++++++++++++------ > mm/page_alloc.c | 3 ++ > mm/sparse-vmemmap.c | 48 +++++++++++++++++++++++++++++--------------- > 9 files changed, 103 insertions(+), 50 deletions(-) > -- To unsubscribe from this list: send the line "unsubscribe linux-s390" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
