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 3/4] uprobe: support huge page by only splitting the pmd
Date: Thu, 30 May 2019 17:37:03 +0000 [thread overview]
Message-ID: <2BF5CB81-166B-45E8-908A-CF5EDAEC05D1@fb.com> (raw)
In-Reply-To: <20190530121400.amti2s5ilrba2wvb@box>
> On May 30, 2019, at 5:14 AM, Kirill A. Shutemov <kirill@shutemov.name> wrote:
>
> On Wed, May 29, 2019 at 02:20:48PM -0700, Song Liu wrote:
>> Instead of splitting the compound page with FOLL_SPLIT, this patch allows
>> uprobe to only split pmd for huge pages.
>>
>> A helper function mm_address_trans_huge(mm, address) was introduced to
>> test whether the address in mm is pointing to THP.
>
> Maybe it would be cleaner to have FOLL_SPLIT_PMD which would strip
> trans_huge PMD if any and then set pte using get_locked_pte()?
FOLL_SPLIT_PMD sounds like a great idea! Let me try it.
Thanks,
Song
>
> This way you'll not need any changes in split_huge_pmd() path. Clearing
> PMD will be fine.
>
> --
> Kirill A. Shutemov
next prev parent reply other threads:[~2019-05-30 17:37 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 [this message]
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
2019-05-31 7:00 ` Kirill A. Shutemov
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