From: Alex Shi <seakeel@gmail.com>
To: David Hildenbrand <david@redhat.com>,
alexs@kernel.org, Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
izik.eidus@ravellosystems.com, willy@infradead.org,
aarcange@redhat.com, chrisw@sous-sol.org, hughd@google.com
Subject: Re: [PATCH 09/10] mm/ksm: calc_checksum for folio
Date: Wed, 5 Jun 2024 11:44:24 +0800 [thread overview]
Message-ID: <0a6603c4-ac05-460c-8bad-66813570b426@gmail.com> (raw)
In-Reply-To: <ddb33c85-35e4-47c5-8a81-13a2012aac5e@redhat.com>
On 6/4/24 9:18 PM, David Hildenbrand wrote:
>> @@ -2369,7 +2371,7 @@ static void cmp_and_merge_page(struct page *page, struct ksm_rmap_item *rmap_ite
>> * don't want to insert it in the unstable tree, and we don't want
>> * to waste our time searching for something identical to it there.
>> */
>> - checksum = calc_checksum(page);
>> + checksum = calc_checksum(folio);
>
> So for a large folio you suddenly checksum more than a single page? That's wrong.
>
> Or am I missing something?
I am not sure if this change are good too, anyway, comparing the whole folio may have it advantages on efficiency, but more splitting do save more pages.
Anyway, this change could be dropped.
Thanks!
next prev parent reply other threads:[~2024-06-05 3:44 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-06-04 4:24 [PATCH 00/10] use folio in ksm alexs
2024-06-04 4:24 ` [PATCH 01/10] mm/ksm: reduce the flush action for ksm merging page alexs
2024-06-04 8:07 ` David Hildenbrand
2024-06-04 10:26 ` Alex Shi
2024-06-04 10:45 ` David Hildenbrand
2024-06-04 13:02 ` Alex Shi
2024-06-05 7:26 ` David Hildenbrand
2024-06-05 9:10 ` Alex Shi
2024-06-05 9:14 ` David Hildenbrand
2024-06-05 9:49 ` Alex Shi
2024-06-05 10:00 ` David Hildenbrand
2024-06-04 4:24 ` [PATCH 02/10] mm/ksm: skip subpages of compound pages alexs
2024-06-04 8:12 ` David Hildenbrand
2024-06-04 10:31 ` Alex Shi
2024-06-04 10:43 ` David Hildenbrand
2024-06-04 13:10 ` Alex Shi
2024-06-04 13:14 ` David Hildenbrand
2024-06-05 3:58 ` Alex Shi
2024-06-05 7:40 ` David Hildenbrand
2024-06-05 3:52 ` Matthew Wilcox
2024-06-05 6:14 ` Alex Shi
2024-06-05 7:47 ` David Hildenbrand
2024-06-05 21:12 ` Matthew Wilcox
2024-06-06 7:11 ` David Hildenbrand
2024-06-04 4:24 ` [PATCH 03/10] mm/ksm: use folio in try_to_merge_one_page alexs
2024-06-04 8:19 ` David Hildenbrand
2024-06-05 3:38 ` Alex Shi
2024-06-04 4:24 ` [PATCH 04/10] mm/ksm: add identical_folio func alexs
2024-06-04 8:25 ` David Hildenbrand
2024-06-04 4:24 ` [PATCH 05/10] mm/ksm: use folio in stable_tree_search alexs
2024-06-04 4:24 ` [PATCH 06/10] mm/ksm: remove page_stable_node alexs
2024-06-04 4:24 ` [PATCH 07/10] mm/ksm: use folio in unstable_tree_search_insert alexs
2024-06-04 4:24 ` [PATCH 08/10] mm/ksm: use folio in try_to_merge_xx serie funcs alexs
2024-06-04 4:24 ` [PATCH 09/10] mm/ksm: calc_checksum for folio alexs
2024-06-04 13:18 ` David Hildenbrand
2024-06-05 3:44 ` Alex Shi [this message]
2024-06-05 7:53 ` David Hildenbrand
2024-06-04 4:24 ` [PATCH 10/10] m/ksm: use folio in ksm scan path alexs
2024-06-04 13:28 ` [PATCH 00/10] use folio in ksm David Hildenbrand
2024-06-05 3:46 ` Alex Shi
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