From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Song Liu <songliubraving@fb.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
oleg@redhat.com, rostedt@goodmis.org, mhiramat@kernel.org,
matthew.wilcox@oracle.com, kirill.shutemov@linux.intel.com,
kernel-team@fb.com
Subject: Re: [PATCH v4 5/5] uprobe: collapse THP pmd after removing all uprobes
Date: Fri, 21 Jun 2019 15:48:23 +0300 [thread overview]
Message-ID: <20190621124823.ziyyx3aagnkobs2n@box> (raw)
In-Reply-To: <20190613175747.1964753-6-songliubraving@fb.com>
On Thu, Jun 13, 2019 at 10:57:47AM -0700, Song Liu wrote:
> After all uprobes are removed from the huge page (with PTE pgtable), it
> is possible to collapse the pmd and benefit from THP again. This patch
> does the collapse.
>
> An issue on earlier version was discovered by kbuild test robot.
>
> Reported-by: kbuild test robot <lkp@intel.com>
> Signed-off-by: Song Liu <songliubraving@fb.com>
> ---
> include/linux/huge_mm.h | 7 +++++
> kernel/events/uprobes.c | 5 ++-
> mm/huge_memory.c | 69 +++++++++++++++++++++++++++++++++++++++++
I still sync it's duplication of khugepaged functinallity. We need to fix
khugepaged to handle SCAN_PAGE_COMPOUND and probably refactor the code to
be able to call for collapse of particular range if we have all locks
taken (as we do in uprobe case).
--
Kirill A. Shutemov
next prev parent reply other threads:[~2019-06-21 12:48 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-13 17:57 [PATCH v4 0/5] THP aware uprobe Song Liu
2019-06-13 17:57 ` [PATCH v4 1/5] mm: move memcmp_pages() and pages_identical() Song Liu
2019-06-13 17:57 ` [PATCH v4 2/5] uprobe: use original page when all uprobes are removed Song Liu
2019-06-13 17:57 ` [PATCH v4 3/5] mm, thp: introduce FOLL_SPLIT_PMD Song Liu
2019-06-21 12:44 ` Kirill A. Shutemov
2019-06-21 14:08 ` Song Liu
2019-06-13 17:57 ` [PATCH v4 4/5] uprobe: use FOLL_SPLIT_PMD instead of FOLL_SPLIT Song Liu
2019-06-13 17:57 ` [PATCH v4 5/5] uprobe: collapse THP pmd after removing all uprobes Song Liu
2019-06-21 12:48 ` Kirill A. Shutemov [this message]
2019-06-21 13:17 ` Song Liu
2019-06-21 13:36 ` Kirill A. Shutemov
2019-06-21 13:45 ` Song Liu
2019-06-21 16:30 ` Song Liu
2019-06-21 18:04 ` Song Liu
2019-06-24 12:34 ` Kirill A. Shutemov
2019-06-17 4:27 ` [PATCH v4 0/5] THP aware uprobe Song Liu
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