From: Yang Shi <shy828301@gmail.com>
To: Rik van Riel <riel@surriel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
kernel-team@fb.com, Matthew Wilcox <willy@infradead.org>
Subject: Re: [PATCH v2] mm: align larger anonymous mappings on THP boundaries
Date: Wed, 10 Aug 2022 10:06:21 -0700 [thread overview]
Message-ID: <CAHbLzkr=QCD5i7X7ns5ZdakYZ3HVS4QnZGnx3UwuvDOqMR0=Wg@mail.gmail.com> (raw)
In-Reply-To: <20220809142457.4751229f@imladris.surriel.com>
On Tue, Aug 9, 2022 at 11:25 AM Rik van Riel <riel@surriel.com> wrote:
>
> Align larger anonymous memory mappings on THP boundaries by
> going through thp_get_unmapped_area if THPs are enabled for
> the current process.
>
> With this patch, larger anonymous mappings are now THP aligned.
> When a malloc library allocates a 2MB or larger arena, that
> arena can now be mapped with THPs right from the start, which
> can result in better TLB hit rates and execution time.
>
> Signed-off-by: Rik van Riel <riel@surriel.com>
> ---
> v2: avoid the chicken & egg issue with MMF_VM_HUGEPAGE (Yang Shi)
Reviewed-by: Yang Shi <shy828301@gmail.com>
>
> mm/mmap.c | 3 +++
> 1 file changed, 3 insertions(+)
>
> diff --git a/mm/mmap.c b/mm/mmap.c
> index c035020d0c89..1d859893436d 100644
> --- a/mm/mmap.c
> +++ b/mm/mmap.c
> @@ -2229,6 +2229,9 @@ get_unmapped_area(struct file *file, unsigned long addr, unsigned long len,
> */
> pgoff = 0;
> get_area = shmem_get_unmapped_area;
> + } else if (IS_ENABLED(CONFIG_TRANSPARENT_HUGEPAGE)) {
> + /* Ensures that larger anonymous mappings are THP aligned. */
> + get_area = thp_get_unmapped_area;
> }
>
> addr = get_area(file, addr, len, pgoff, flags);
> --
> 2.37.1
>
>
next prev parent reply other threads:[~2022-08-10 17:06 UTC|newest]
Thread overview: 29+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-08-09 18:24 [PATCH v2] mm: align larger anonymous mappings on THP boundaries Rik van Riel
2022-08-10 17:06 ` Yang Shi [this message]
2024-01-16 11:53 ` Jiri Slaby
2024-01-16 12:09 ` Jiri Slaby
2024-01-16 19:16 ` Suren Baghdasaryan
2024-01-16 20:56 ` Yang Shi
2024-01-16 21:57 ` Suren Baghdasaryan
2024-01-16 22:25 ` Yang Shi
2024-01-16 22:30 ` Suren Baghdasaryan
2024-01-16 23:14 ` Yang Shi
2024-01-17 17:40 ` Kees Cook
2024-01-17 23:32 ` Yang Shi
2024-01-18 0:01 ` Suren Baghdasaryan
2024-01-18 0:13 ` Yang Shi
2024-01-18 0:29 ` Suren Baghdasaryan
2024-01-18 1:34 ` Suren Baghdasaryan
2024-01-18 2:10 ` Suren Baghdasaryan
2024-01-16 20:55 ` Yang Shi
2024-01-18 0:07 ` Yang Shi
2024-01-18 0:09 ` Suren Baghdasaryan
2024-01-18 0:11 ` Suren Baghdasaryan
2024-01-18 0:15 ` Yang Shi
2024-01-18 0:28 ` Suren Baghdasaryan
2024-01-18 7:04 ` Jiri Slaby
2024-01-18 17:48 ` Suren Baghdasaryan
2024-01-18 18:42 ` Yang Shi
2024-01-18 18:42 ` Yang Shi
2024-01-20 13:43 ` Linux regression tracking #adding (Thorsten Leemhuis)
2024-01-20 15:47 ` Linux regression tracking #adding (Thorsten Leemhuis)
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