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From: Muchun Song <songmuchun@bytedance.com>
To: Oscar Salvador <osalvador@suse.de>
Cc: Jonathan Corbet <corbet@lwn.net>,
	Mike Kravetz <mike.kravetz@oracle.com>,
	 Thomas Gleixner <tglx@linutronix.de>,
	mingo@redhat.com, bp@alien8.de, x86@kernel.org,  hpa@zytor.com,
	dave.hansen@linux.intel.com, luto@kernel.org,
	 Peter Zijlstra <peterz@infradead.org>,
	viro@zeniv.linux.org.uk,
	 Andrew Morton <akpm@linux-foundation.org>,
	paulmck@kernel.org, mchehab+huawei@kernel.org,
	 pawan.kumar.gupta@linux.intel.com,
	Randy Dunlap <rdunlap@infradead.org>,
	oneukum@suse.com,  anshuman.khandual@arm.com, jroedel@suse.de,
	 Mina Almasry <almasrymina@google.com>,
	David Rientjes <rientjes@google.com>,
	 Matthew Wilcox <willy@infradead.org>,
	Michal Hocko <mhocko@suse.com>,
	 "Song Bao Hua (Barry Song)" <song.bao.hua@hisilicon.com>,
	David Hildenbrand <david@redhat.com>,
	 Xiongchun duan <duanxiongchun@bytedance.com>,
	linux-doc@vger.kernel.org,  LKML <linux-kernel@vger.kernel.org>,
	 Linux Memory Management List <linux-mm@kvack.org>,
	linux-fsdevel <linux-fsdevel@vger.kernel.org>
Subject: Re: [External] Re: [PATCH v9 03/11] mm/hugetlb: Free the vmemmap pages associated with each HugeTLB page
Date: Wed, 16 Dec 2020 21:15:37 +0800	[thread overview]
Message-ID: <CAMZfGtXvvkjChhKL3TtTEW50P3w8ekrnUDbhZM1Z3XWgsf_n_w@mail.gmail.com> (raw)
In-Reply-To: <20201216130602.GA29394@linux>

On Wed, Dec 16, 2020 at 9:06 PM Oscar Salvador <osalvador@suse.de> wrote:
>
> On Sun, Dec 13, 2020 at 11:45:26PM +0800, Muchun Song wrote:
> > +
> > +/*
> > + * vmemmap_rmap_walk - walk vmemmap page table
> > + *
> > + * @rmap_pte:                called for each non-empty PTE (lowest-level) entry.
> > + * @reuse:           the page which is reused for the tail vmemmap pages.
> > + * @vmemmap_pages:   the list head of the vmemmap pages that can be freed.
> > + */
> > +struct vmemmap_rmap_walk {
> > +     void (*rmap_pte)(pte_t *pte, unsigned long addr,
> > +                      struct vmemmap_rmap_walk *walk);
> > +     struct page *reuse;
> > +     struct list_head *vmemmap_pages;
> > +};
>
> Why did you chose this approach in this version?
> Earlier versions of this patchset had a single vmemmap_to_pmd() function
> which returned the PMD, and now we have serveral vmemmap_{levels}_range
> and a vmemmap_rmap_walk.

This approach will be more universal. :-)

> A brief explanation about why this change was introduced would have been nice.
>
> I guess it is because ealier versions were too oriented for the usecase
> this patchset presents, while the new versions tries to be more broad
> about future re-uses of the interface?

Yeah, you are right. I plan to reuse those interfaces in the feature.

Thanks.

>
>
> --
> Oscar Salvador
> SUSE L3



-- 
Yours,
Muchun


  reply	other threads:[~2020-12-16 13:16 UTC|newest]

Thread overview: 43+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-13 15:45 [PATCH v9 00/11] Free some vmemmap pages of HugeTLB page Muchun Song
2020-12-13 15:45 ` [PATCH v9 01/11] mm/memory_hotplug: Factor out bootmem core functions to bootmem_info.c Muchun Song
2020-12-13 15:45 ` [PATCH v9 02/11] mm/hugetlb: Introduce a new config HUGETLB_PAGE_FREE_VMEMMAP Muchun Song
2020-12-16  1:03   ` Mike Kravetz
2020-12-16  3:24     ` [External] " Muchun Song
2020-12-16  3:45     ` Mike Kravetz
2020-12-16  3:52       ` [External] " Muchun Song
2020-12-13 15:45 ` [PATCH v9 03/11] mm/hugetlb: Free the vmemmap pages associated with each HugeTLB page Muchun Song
2020-12-16 13:06   ` Oscar Salvador
2020-12-16 13:15     ` Muchun Song [this message]
2020-12-16 22:08   ` Mike Kravetz
2020-12-16 22:25     ` Oscar Salvador
2020-12-16 22:49       ` Mike Kravetz
2020-12-17  6:54         ` [External] " Muchun Song
2020-12-17  9:05           ` Muchun Song
2020-12-17  4:06     ` Muchun Song
2020-12-13 15:45 ` [PATCH v9 04/11] mm/hugetlb: Defer freeing of HugeTLB pages Muchun Song
2020-12-16 23:48   ` Mike Kravetz
2020-12-17  3:19     ` [External] " Muchun Song
2020-12-13 15:45 ` [PATCH v9 05/11] mm/hugetlb: Allocate the vmemmap pages associated with each HugeTLB page Muchun Song
2020-12-17  1:17   ` Mike Kravetz
2020-12-17  3:22     ` [External] " Muchun Song
2020-12-13 15:45 ` [PATCH v9 06/11] mm/hugetlb: Set the PageHWPoison to the raw error page Muchun Song
2020-12-16 13:28   ` Oscar Salvador
2020-12-16 13:51     ` [External] " Muchun Song
2020-12-16 13:30   ` Oscar Salvador
2020-12-13 15:45 ` [PATCH v9 07/11] mm/hugetlb: Flush work when dissolving hugetlb page Muchun Song
2020-12-13 15:45 ` [PATCH v9 08/11] mm/hugetlb: Add a kernel parameter hugetlb_free_vmemmap Muchun Song
2020-12-16 14:40   ` Oscar Salvador
2020-12-16 16:04     ` [External] " Muchun Song
2020-12-16 22:10       ` Oscar Salvador
2020-12-17  2:45         ` Muchun Song
2020-12-13 15:45 ` [PATCH v9 09/11] mm/hugetlb: Introduce nr_free_vmemmap_pages in the struct hstate Muchun Song
2020-12-16 13:43   ` Oscar Salvador
2020-12-16 13:56     ` [External] " Muchun Song
2020-12-16 22:12       ` Oscar Salvador
2020-12-17  8:34     ` Muchun Song
2020-12-13 15:45 ` [PATCH v9 10/11] mm/hugetlb: Gather discrete indexes of tail page Muchun Song
2020-12-16 14:03   ` Oscar Salvador
2020-12-16 14:26     ` [External] " Muchun Song
2020-12-13 15:45 ` [PATCH v9 11/11] mm/hugetlb: Optimize the code with the help of the compiler Muchun Song
2020-12-17 10:31   ` Oscar Salvador
2020-12-17 10:42     ` [External] " Muchun Song

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