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Message-ID: <20190801184823.3184410-1-songliubraving@fb.com>
Date: Thu, 1 Aug 2019 11:48:21 -0700
From: Song Liu <songliubraving@...com>
To: <linux-kernel@...r.kernel.org>, <linux-mm@...ck.org>,
<akpm@...ux-foundation.org>
CC: <matthew.wilcox@...cle.com>, <kirill.shutemov@...ux.intel.com>,
<oleg@...hat.com>, <kernel-team@...com>,
<william.kucharski@...cle.com>, <srikar@...ux.vnet.ibm.com>,
Song Liu <songliubraving@...com>
Subject: [PATCH v3 0/2] khugepaged: collapse pmd for pte-mapped THP
Changes v2 => v3:
1. Update vma/pmd check in collapse_pte_mapped_thp() (Oleg).
2. Add Acked-by from Kirill
Changes v1 => v2:
1. Call collapse_pte_mapped_thp() directly from uprobe_write_opcode();
2. Add VM_BUG_ON() for addr alignment in khugepaged_add_pte_mapped_thp()
and collapse_pte_mapped_thp().
This set is the newer version of 5/6 and 6/6 of [1]. Newer version of
1-4 of the work [2] was recently picked by Andrew.
Patch 1 enables khugepaged to handle pte-mapped THP. These THPs are left
in such state when khugepaged failed to get exclusive lock of mmap_sem.
Patch 2 leverages work in 1 for uprobe on THP. After [2], uprobe only
splits the PMD. When the uprobe is disabled, we get pte-mapped THP.
After this set, these pte-mapped THP will be collapsed as pmd-mapped.
[1] https://lkml.org/lkml/2019/6/23/23
[2] https://www.spinics.net/lists/linux-mm/msg185889.html
Song Liu (2):
khugepaged: enable collapse pmd for pte-mapped THP
uprobe: collapse THP pmd after removing all uprobes
include/linux/khugepaged.h | 12 ++++
kernel/events/uprobes.c | 9 +++
mm/khugepaged.c | 140 +++++++++++++++++++++++++++++++++++++
3 files changed, 161 insertions(+)
--
2.17.1
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