From: Peter Xu <peterx@redhat.com>
To: Mike Kravetz <mike.kravetz@oracle.com>
Cc: linux-mm@kvack.org, linux-kernel@vger.kernel.org,
linux-s390@vger.kernel.org, shu wang <malate_wangshu@hotmail.com>,
Axel Rasmussen <axelrasmussen@google.com>,
Andrea Arcangeli <aarcange@redhat.com>,
Heiko Carstens <hca@linux.ibm.com>,
Alexey Dobriyan <adobriyan@gmail.com>,
Matthew Wilcox <willy@infradead.org>,
Michel Lespinasse <walken@google.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [RFC PATCH 3/5] mm proc/task_mmu.c: add soft dirty pte checks for hugetlb
Date: Wed, 17 Feb 2021 14:35:50 -0500 [thread overview]
Message-ID: <20210217193550.GC6519@xz-x1> (raw)
In-Reply-To: <20210211000322.159437-4-mike.kravetz@oracle.com>
On Wed, Feb 10, 2021 at 04:03:20PM -0800, Mike Kravetz wrote:
> Pagemap was only using the vma flag PM_SOFT_DIRTY for hugetlb vmas.
> This is insufficient. Check the individual pte entries.
>
> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
> ---
> fs/proc/task_mmu.c | 4 ++++
> 1 file changed, 4 insertions(+)
>
> diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
> index 602e3a52884d..829b35016aaa 100644
> --- a/fs/proc/task_mmu.c
> +++ b/fs/proc/task_mmu.c
> @@ -1507,6 +1507,10 @@ static int pagemap_hugetlb_range(pte_t *ptep, unsigned long hmask,
> flags |= PM_SOFT_DIRTY;
>
> pte = huge_ptep_get(ptep);
> +
> + if (huge_pte_soft_dirty(pte))
> + flags |= PM_SOFT_DIRTY;
Should this be put into pte_present() chunk below? Since I feel like we'd need
huge_pte_swp_soft_dirty() for !pte_present(). Say, _PAGE_SOFT_DIRTY and
_PAGE_SWP_SOFT_DIRTY can be different.
> +
> if (pte_present(pte)) {
> struct page *page = pte_page(pte);
>
> --
> 2.29.2
>
--
Peter Xu
next prev parent reply other threads:[~2021-02-17 19:35 UTC|newest]
Thread overview: 17+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-11 0:03 [RFC PATCH 0/5] Add hugetlb soft dirty support Mike Kravetz
2021-02-11 0:03 ` [RFC PATCH 1/5] hugetlb: add hugetlb helpers for " Mike Kravetz
2021-02-17 16:24 ` Peter Xu
2021-02-18 22:58 ` Mike Kravetz
2021-02-24 16:46 ` Gerald Schaefer
2021-02-24 16:55 ` Gerald Schaefer
2021-02-11 0:03 ` [RFC PATCH 2/5] hugetlb: enhance hugetlb fault processing to support soft dirty Mike Kravetz
2021-02-17 19:32 ` Peter Xu
2021-02-18 23:26 ` Mike Kravetz
2021-02-11 0:03 ` [RFC PATCH 3/5] mm proc/task_mmu.c: add soft dirty pte checks for hugetlb Mike Kravetz
2021-02-17 19:35 ` Peter Xu [this message]
2021-02-18 23:59 ` Mike Kravetz
2021-02-11 0:03 ` [RFC PATCH 4/5] hugetlb: don't permit pmd sharing if soft dirty in use Mike Kravetz
2021-02-17 19:44 ` Peter Xu
2021-02-11 0:03 ` [RFC PATCH 5/5] mm proc/task_mmu.c: add hugetlb specific routine for clear_refs Mike Kravetz
2021-02-17 20:25 ` Peter Xu
2021-02-19 0:14 ` Mike Kravetz
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