From: Matthew Wilcox <willy@infradead.org>
To: Kefeng Wang <wangkefeng.wang@huawei.com>
Cc: Andrew Morton <akpm@linux-foundation.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org,
ying.huang@intel.com, david@redhat.com, Zi Yan <ziy@nvidia.com>,
Ingo Molnar <mingo@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>
Subject: Re: [PATCH -next v2 18/19] mm: use folio_xchg_last_cpupid() in wp_page_reuse()
Date: Fri, 13 Oct 2023 16:19:05 +0100 [thread overview]
Message-ID: <ZSlf6fPfuOo4QmDt@casper.infradead.org> (raw)
In-Reply-To: <20231013085603.1227349-19-wangkefeng.wang@huawei.com>
On Fri, Oct 13, 2023 at 04:56:02PM +0800, Kefeng Wang wrote:
> Convert to use folio_xchg_last_cpupid() in wp_page_reuse(), and remove
> page variable.
... another case where we're changing behaviour and need to argue it's
desirable.
> - /*
> - * Clear the pages cpupid information as the existing
> - * information potentially belongs to a now completely
> - * unrelated process.
> - */
> - if (page)
> - page_cpupid_xchg_last(page, (1 << LAST_CPUPID_SHIFT) - 1);
> + if (folio) {
> + VM_BUG_ON(folio_test_anon(folio) &&
> + !PageAnonExclusive(vmf->page));
> + /*
> + * Clear the pages cpupid information as the existing
s/pages/folio's/
> + * information potentially belongs to a now completely
> + * unrelated process.
> + */
> + folio_xchg_last_cpupid(folio, (1 << LAST_CPUPID_SHIFT) - 1);
> + }
next prev parent reply other threads:[~2023-10-13 15:19 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-13 8:55 [PATCH -next v2 00/19] mm: convert page cpupid functions to folios Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 01/19] mm_types: add virtual and _last_cpupid into struct folio Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 02/19] mm: add folio_last_cpupid() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 03/19] mm: memory: use folio_last_cpupid() in do_numa_page() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 04/19] mm: huge_memory: use folio_last_cpupid() in do_huge_pmd_numa_page() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 05/19] mm: huge_memory: use folio_last_cpupid() in __split_huge_page_tail() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 06/19] mm: remove page_cpupid_last() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 07/19] mm: add folio_xchg_access_time() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 08/19] sched/fair: use folio_xchg_access_time() in numa_hint_fault_latency() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 09/19] mm: mprotect: use a folio in change_pte_range() Kefeng Wang
2023-10-13 15:13 ` Matthew Wilcox
2023-10-14 3:11 ` Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 10/19] mm: huge_memory: use a folio in change_huge_pmd() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 11/19] mm: remove xchg_page_access_time() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 12/19] mm: add folio_xchg_last_cpupid() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 13/19] sched/fair: use folio_xchg_last_cpupid() in should_numa_migrate_memory() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 14/19] mm: migrate: use folio_xchg_last_cpupid() in folio_migrate_flags() Kefeng Wang
2023-10-13 8:55 ` [PATCH -next v2 15/19] mm: huge_memory: use folio_xchg_last_cpupid() in __split_huge_page_tail() Kefeng Wang
2023-10-13 8:56 ` [PATCH -next v2 16/19] mm: make finish_mkwrite_fault() static Kefeng Wang
2023-10-13 8:56 ` [PATCH -next v2 17/19] mm: convert wp_page_reuse() and finish_mkwrite_fault() to take a folio Kefeng Wang
2023-10-17 7:33 ` kernel test robot
2023-10-17 9:04 ` Kefeng Wang
2023-10-17 14:51 ` Andrew Morton
2023-10-13 8:56 ` [PATCH -next v2 18/19] mm: use folio_xchg_last_cpupid() in wp_page_reuse() Kefeng Wang
2023-10-13 15:19 ` Matthew Wilcox [this message]
2023-10-13 8:56 ` [PATCH -next v2 19/19] mm: remove page_cpupid_xchg_last() Kefeng Wang
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