linux-kernel - [PATCH v2 0/5] Fix the incorrect memmep defer init handling and do some cleanup

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Date:   Sun, 20 Dec 2020 16:27:49 +0800
From:   Baoquan He <bhe@...hat.com>
To:     linux-kernel@...r.kernel.org
Cc:     linux-mm@...ck.org, akpm@...ux-foundation.org,
        gopakumarr@...are.com, rppt@...nel.org, david@...hat.com,
        bhe@...hat.com
Subject: [PATCH v2 0/5] Fix the incorrect memmep defer init handling and do some cleanup 

VMware reported the performance regression during memmap_init() invocation.
And they bisected to commit 73a6e474cb376 ("mm: memmap_init: iterate over
memblock regions rather that check each PFN") causing it.

https://lore.kernel.org/linux-mm/DM6PR05MB52921FF90FA01CC337DD23A1A4080@DM6PR05MB5292.namprd05.prod.outlook.com/

After investigation, it's caused by incorrect memmap init defer handling
in memmap_init_zone() after commit 73a6e474cb376. The current
memmap_init_zone() only handle one memory region of one zone, while
memmap_init() iterates over all its memory regions and pass them one by
one into memmap_init_zone() to handle.

So in this patchset, patch 1/5 fixes the bug observed by VMware. Patch
2~5/5 clean up codes.
accordingly.

VMware helped do the testing for the patch 1 of v1 version which was based
on master branch of Linus's tree on their VMware ESI platform, while the
patch 1 is not changed in functionality in v2. And I haven't got a
ia64 machine to compile or test, will really appreciate if anyone can help
compile this patchset on one. This patchset is based on the latest next/master,
only did the basic test.  

Baoquan He (5):
  mm: memmap defer init dosn't work as expected
  mm: rename memmap_init() and memmap_init_zone()
  mm: simplify parater of function memmap_init_zone()
  mm: simplify parameter of setup_usemap()
  mm: remove unneeded local variable in free_area_init_core

 arch/ia64/include/asm/pgtable.h |  3 +-
 arch/ia64/mm/init.c             | 16 +++++----
 include/linux/mm.h              |  5 +--
 mm/memory_hotplug.c             |  2 +-
 mm/page_alloc.c                 | 60 ++++++++++++++++-----------------
 5 files changed, 43 insertions(+), 43 deletions(-)

-- 
2.17.2