From: David Hildenbrand <david@redhat.com>
To: Matthew Wilcox <willy@infradead.org>
Cc: "Yin, Fengwei" <fengwei.yin@intel.com>,
"akpm@linux-foundation.org" <akpm@linux-foundation.org>,
"linux-mm@kvack.org" <linux-mm@kvack.org>,
"mike.kravetz@oracle.com" <mike.kravetz@oracle.com>,
"sidhartha.kumar@oracle.com" <sidhartha.kumar@oracle.com>,
"naoya.horiguchi@nec.com" <naoya.horiguchi@nec.com>,
"chu, jane" <jane.chu@oracle.com>
Subject: Re: [PATCH v2 0/5] batched remove rmap in try_to_unmap_one()
Date: Thu, 2 Mar 2023 15:55:05 +0100 [thread overview]
Message-ID: <15cf14e3-946e-269b-f98d-004c395524ae@redhat.com> (raw)
In-Reply-To: <ZACzxCJZ8yBChL00@casper.infradead.org>
On 02.03.23 15:33, Matthew Wilcox wrote:
> On Thu, Mar 02, 2023 at 03:23:46PM +0100, David Hildenbrand wrote:
>> If no workload/benchmark is affected (or simply corner cases where nobody
>> cares about performance), I hope you understand that it's hard to argue why
>> we should care about such an optimization then.
>
> In order to solve the mapcount problem, we're going to want to unmap
> the entire folio in one call, instead of unmapping each page in it
> individually and checking each time whether there are any remaining
> pages from this folio still mapped.
Okay, thanks. That should better be added to the cover letter, ideally
with more details on the mapcount goal and how this patch set will helps
in that regard. So far the cover letter only talks about eventual
performance gains.
--
Thanks,
David / dhildenb
next prev parent reply other threads:[~2023-03-02 14:55 UTC|newest]
Thread overview: 16+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-28 12:23 [PATCH v2 0/5] batched remove rmap in try_to_unmap_one() Yin Fengwei
2023-02-28 12:23 ` [PATCH v2 1/5] rmap: move hugetlb try_to_unmap to dedicated function Yin Fengwei
2023-02-28 12:23 ` [PATCH v2 2/5] rmap: move page unmap operation " Yin Fengwei
2023-02-28 12:23 ` [PATCH v2 3/5] rmap: cleanup exit path of try_to_unmap_one_page() Yin Fengwei
2023-02-28 12:23 ` [PATCH v2 4/5] rmap:addd folio_remove_rmap_range() Yin Fengwei
2023-02-28 12:23 ` [PATCH v2 5/5] try_to_unmap_one: batched remove rmap, update folio refcount Yin Fengwei
2023-02-28 20:28 ` [PATCH v2 0/5] batched remove rmap in try_to_unmap_one() Andrew Morton
2023-03-01 1:44 ` Yin, Fengwei
2023-03-02 10:04 ` David Hildenbrand
2023-03-02 13:32 ` Yin, Fengwei
2023-03-02 14:23 ` David Hildenbrand
2023-03-02 14:33 ` Matthew Wilcox
2023-03-02 14:55 ` David Hildenbrand [this message]
2023-03-03 2:44 ` Yin, Fengwei
2023-03-03 2:26 ` Yin, Fengwei
2023-03-06 9:11 ` Yin Fengwei
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