On Fri, 8 Dec 2023, Gang Li wrote: > Hi all, hugetlb init parallelization has now been updated to v2. > > To David Hildenbrand: padata multithread utilities has been used to reduce > code complexity. > > To David Rientjes: The patch for measuring time will be separately included > in the reply. Please test during your free time, thanks. > I'd love to, but what kernel is this based on? :) I can't get this to apply to any kernels that I have recently benchmarked with. > # Introduction > Hugetlb initialization during boot takes up a considerable amount of time. > For instance, on a 2TB system, initializing 1,800 1GB huge pages takes 1-2 > seconds out of 10 seconds. Initializing 11,776 1GB pages on a 12TB Intel > host takes 65.2 seconds [1], which is 17.4% of the total 373.78 seconds boot > time. This is a noteworthy figure. > > Inspired by [2] and [3], hugetlb initialization can also be accelerated > through parallelization. Kernel already has infrastructure like > padata_do_multithreaded, this patch uses it to achieve effective results > by minimal modifications. > > [1] https://lore.kernel.org/all/783f8bac-55b8-5b95-eb6a-11a583675000@xxxxxxxxxx/ > [2] https://lore.kernel.org/all/20200527173608.2885243-1-daniel.m.jordan@xxxxxxxxxx/ > [3] https://lore.kernel.org/all/20230906112605.2286994-1-usama.arif@xxxxxxxxxxxxx/ > > # Test result > test no patch(ms) patched(ms) saved > ------------------- -------------- ------------- -------- > 256c2t(4 node) 2M 2624 956 63.57% > 256c2t(4 node) 1G 2679 1582 40.95% > 128c1t(2 node) 2M 1788 684 61.74% > 128c1t(2 node) 1G 3160 1618 48.80% > > # Change log > Changes in v2: > - Reduce complexity with `padata_do_multithreaded` > - Support 1G hugetlb > > v1: > - https://lore.kernel.org/all/20231123133036.68540-1-gang.li@xxxxxxxxx/ > - parallelize 2M hugetlb initialization with workqueue > > Gang Li (5): > hugetlb: code clean for hugetlb_hstate_alloc_pages > hugetlb: split hugetlb_hstate_alloc_pages > padata: dispatch works on different nodes > hugetlb: parallelize 2M hugetlb allocation and initialization > hugetlb: parallelize 1G hugetlb initialization > > include/linux/hugetlb.h | 2 +- > include/linux/padata.h | 2 + > kernel/padata.c | 8 +- > mm/hugetlb.c | 201 +++++++++++++++++++++++++++------------- > mm/mm_init.c | 1 + > 5 files changed, 148 insertions(+), 66 deletions(-) > > -- > 2.30.2 > >
