From: Song Liu <songliubraving@fb.com>
To: "Kirill A. Shutemov" <kirill@shutemov.name>
Cc: LKML <linux-kernel@vger.kernel.org>,
Linux-MM <linux-mm@kvack.org>,
"namit@vmware.com" <namit@vmware.com>,
"peterz@infradead.org" <peterz@infradead.org>,
"oleg@redhat.com" <oleg@redhat.com>,
"rostedt@goodmis.org" <rostedt@goodmis.org>,
"mhiramat@kernel.org" <mhiramat@kernel.org>,
"matthew.wilcox@oracle.com" <matthew.wilcox@oracle.com>,
"kirill.shutemov@linux.intel.com"
<kirill.shutemov@linux.intel.com>,
Kernel Team <Kernel-team@fb.com>,
"william.kucharski@oracle.com" <william.kucharski@oracle.com>,
"chad.mynhier@oracle.com" <chad.mynhier@oracle.com>,
"mike.kravetz@oracle.com" <mike.kravetz@oracle.com>
Subject: Re: [PATCH uprobe, thp 4/4] uprobe: collapse THP pmd after removing all uprobes
Date: Thu, 30 May 2019 17:26:38 +0000 [thread overview]
Message-ID: <4E8A7A5E-D425-40EC-B40A-7DA21BA1866F@fb.com> (raw)
In-Reply-To: <20190530122055.xzlbo3wfpqtmo2fw@box>
> On May 30, 2019, at 5:20 AM, Kirill A. Shutemov <kirill@shutemov.name> wrote:
>
> On Wed, May 29, 2019 at 02:20:49PM -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.
>
> I don't think it's right way to go. We should deferred it to khugepaged.
> We need to teach khugepaged to deal with PTE-mapped compound page.
> And uprobe should only kick khugepaged for a VMA. Maybe synchronously.
>
I guess that would be the same logic, but run in khugepaged? It doesn't
have to be done synchronously.
Let me try that
Thanks,
Song
> --
> Kirill A. Shutemov
next prev parent reply other threads:[~2019-05-30 17:27 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-05-29 21:20 [PATCH uprobe, thp 0/4] THP aware uprobe Song Liu
2019-05-29 21:20 ` [PATCH uprobe, thp 1/4] mm, thp: allow preallocate pgtable for split_huge_pmd_address() Song Liu
2019-05-30 11:10 ` Kirill A. Shutemov
2019-05-30 11:14 ` Kirill A. Shutemov
2019-05-30 17:23 ` Song Liu
2019-05-29 21:20 ` [PATCH uprobe, thp 2/4] uprobe: use original page when all uprobes are removed Song Liu
2019-05-30 11:17 ` Kirill A. Shutemov
2019-05-30 17:18 ` Song Liu
2019-05-29 21:20 ` [PATCH uprobe, thp 3/4] uprobe: support huge page by only splitting the pmd Song Liu
2019-05-30 11:08 ` William Kucharski
2019-05-30 17:24 ` Song Liu
2019-05-30 12:14 ` Kirill A. Shutemov
2019-05-30 17:37 ` Song Liu
2019-05-29 21:20 ` [PATCH uprobe, thp 4/4] uprobe: collapse THP pmd after removing all uprobes Song Liu
2019-05-30 12:20 ` Kirill A. Shutemov
2019-05-30 17:26 ` Song Liu [this message]
2019-05-31 7:00 ` Kirill A. Shutemov
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