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* [v2 0/6] mm/memblock: Skip prep and initialization of struct pages freed later by HVO
@ 2023-07-30 15:16 Usama Arif
  2023-07-30 15:16 ` [v2 1/6] mm: hugetlb: Skip prep of tail pages when HVO is enabled Usama Arif
                   ` (6 more replies)
  0 siblings, 7 replies; 17+ messages in thread
From: Usama Arif @ 2023-07-30 15:16 UTC (permalink / raw)
  To: linux-mm, muchun.song, mike.kravetz, rppt
  Cc: linux-kernel, fam.zheng, liangma, simon.evans, punit.agrawal,
	Usama Arif

If the region is for gigantic hugepages and if HVO is enabled, then those
struct pages which will be freed later by HVO don't need to be prepared and
initialized. This can save significant time when a large number of hugepages
are allocated at boot time.

For a 1G hugepage, this series avoid initialization and preparation of
262144 - 64 = 262080 struct pages per hugepage.

When tested on a 512G system (which can allocate max 500 1G hugepages), the
kexec-boot time with HVO and DEFERRED_STRUCT_PAGE_INIT enabled without this
patchseries to running init is 3.9 seconds. With this patch it is 1.2 seconds.
This represents an approximately 70% reduction in boot time and will
significantly reduce server downtime when using a large number of
gigantic pages.

Thanks,
Usama

[v1->v2]:
- (Mike Rapoport) Code quality improvements (function names, arguments,
comments).

[RFC->v1]:
- (Mike Rapoport) Change from passing hugepage_size in
memblock_alloc_try_nid_raw for skipping struct page initialization to
using MEMBLOCK_RSRV_NOINIT flag



Usama Arif (6):
  mm: hugetlb: Skip prep of tail pages when HVO is enabled
  mm: hugetlb_vmemmap: Use nid of the head page to reallocate it
  memblock: pass memblock_type to memblock_setclr_flag
  memblock: introduce MEMBLOCK_RSRV_NOINIT flag
  mm: move allocation of gigantic hstates to the start of mm_core_init
  mm: hugetlb: Skip initialization of struct pages freed later by HVO

 include/linux/memblock.h |  9 +++++
 mm/hugetlb.c             | 71 +++++++++++++++++++++++++---------------
 mm/hugetlb_vmemmap.c     |  6 ++--
 mm/hugetlb_vmemmap.h     | 18 +++++++---
 mm/internal.h            |  9 +++++
 mm/memblock.c            | 45 +++++++++++++++++--------
 mm/mm_init.c             |  6 ++++
 7 files changed, 118 insertions(+), 46 deletions(-)

-- 
2.25.1



^ permalink raw reply	[flat|nested] 17+ messages in thread

end of thread, other threads:[~2023-08-02 10:06 UTC | newest]

Thread overview: 17+ messages (download: mbox.gz follow: Atom feed
-- links below jump to the message on this page --
2023-07-30 15:16 [v2 0/6] mm/memblock: Skip prep and initialization of struct pages freed later by HVO Usama Arif
2023-07-30 15:16 ` [v2 1/6] mm: hugetlb: Skip prep of tail pages when HVO is enabled Usama Arif
2023-07-31 23:18   ` Mike Kravetz
2023-08-02 10:05     ` [External] " Usama Arif
2023-08-01  2:04   ` Muchun Song
2023-08-02 10:06     ` [External] " Usama Arif
2023-07-30 15:16 ` [v2 2/6] mm: hugetlb_vmemmap: Use nid of the head page to reallocate it Usama Arif
2023-07-30 15:16 ` [v2 3/6] memblock: pass memblock_type to memblock_setclr_flag Usama Arif
2023-07-30 15:16 ` [v2 4/6] memblock: introduce MEMBLOCK_RSRV_NOINIT flag Usama Arif
2023-07-30 15:16 ` [v2 5/6] mm: move allocation of gigantic hstates to the start of mm_core_init Usama Arif
2023-07-30 16:49   ` kernel test robot
2023-08-01  3:07   ` Muchun Song
2023-07-30 15:16 ` [v2 6/6] mm: hugetlb: Skip initialization of struct pages freed later by HVO Usama Arif
2023-07-30 19:33   ` kernel test robot
2023-07-31  0:11   ` kernel test robot
2023-07-31  6:46   ` kernel test robot
2023-07-30 22:28 ` [v2 0/6] mm/memblock: Skip prep and " Usama Arif

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