From: Oscar Salvador <osalvador@suse.de>
To: Mike Kravetz <mike.kravetz@oracle.com>
Cc: linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Michal Hocko <mhocko@kernel.org>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Muchun Song <songmuchun@bytedance.com>,
David Hildenbrand <david@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Miaohe Lin <linmiaohe@huawei.com>,
Andrew Morton <akpm@linux-foundation.org>
Subject: Re: [PATCH v3 1/5] hugetlb: use page.private for hugetlb specific page flags
Date: Tue, 26 Jan 2021 09:17:23 +0100 [thread overview]
Message-ID: <20210126081716.GA9519@linux> (raw)
In-Reply-To: <20210122195231.324857-2-mike.kravetz@oracle.com>
On Fri, Jan 22, 2021 at 11:52:27AM -0800, Mike Kravetz wrote:
> As hugetlbfs evolved, state information about hugetlb pages was added.
> One 'convenient' way of doing this was to use available fields in tail
> pages. Over time, it has become difficult to know the meaning or contents
> of fields simply by looking at a small bit of code. Sometimes, the
> naming is just confusing. For example: The PagePrivate flag indicates
> a huge page reservation was consumed and needs to be restored if an error
> is encountered and the page is freed before it is instantiated. The
> page.private field contains the pointer to a subpool if the page is
> associated with one.
>
> In an effort to make the code more readable, use page.private to contain
> hugetlb specific page flags. These flags will have test, set and clear
> functions similar to those used for 'normal' page flags. More importantly,
> an enum of flag values will be created with names that actually reflect
> their purpose.
>
> In this patch,
> - Create infrastructure for hugetlb specific page flag functions
> - Move subpool pointer to page[1].private to make way for flags
> Create routines with meaningful names to modify subpool field
> - Use new HPageRestoreReserve flag instead of PagePrivate
>
> Conversion of other state information will happen in subsequent patches.
>
> Signed-off-by: Mike Kravetz <mike.kravetz@oracle.com>
Reviewed-by: Oscar Salvador <osalvador@suse.de>
--
Oscar Salvador
SUSE L3
next prev parent reply other threads:[~2021-01-26 8:17 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-01-22 19:52 [PATCH v3 0/5] create hugetlb flags to consolidate state Mike Kravetz
2021-01-22 19:52 ` [PATCH v3 1/5] hugetlb: use page.private for hugetlb specific page flags Mike Kravetz
2021-01-26 8:17 ` Oscar Salvador [this message]
2021-01-27 10:20 ` Michal Hocko
2021-01-27 23:01 ` Mike Kravetz
2021-01-27 10:26 ` Michal Hocko
2021-01-22 19:52 ` [PATCH v3 2/5] hugetlb: convert page_huge_active() HPageMigratable flag Mike Kravetz
2021-01-27 10:25 ` Michal Hocko
2021-01-27 23:27 ` Mike Kravetz
2021-01-22 19:52 ` [PATCH v3 3/5] hugetlb: only set HPageMigratable for migratable hstates Mike Kravetz
2021-01-26 8:20 ` Oscar Salvador
2021-01-27 10:35 ` Michal Hocko
2021-01-27 23:36 ` Mike Kravetz
2021-01-28 5:52 ` Oscar Salvador
2021-01-28 21:37 ` Andrew Morton
2021-01-28 22:00 ` Mike Kravetz
2021-01-28 22:15 ` Andrew Morton
2021-01-29 9:09 ` Michal Hocko
2021-01-29 18:46 ` Mike Kravetz
2021-02-01 11:49 ` Michal Hocko
2021-02-04 1:11 ` Mike Kravetz
2021-01-22 19:52 ` [PATCH v3 4/5] hugetlb: convert PageHugeTemporary() to HPageTemporary flag Mike Kravetz
2021-01-23 3:15 ` [External] " Muchun Song
2021-01-27 10:39 ` Michal Hocko
2021-01-22 19:52 ` [PATCH v3 5/5] hugetlb: convert PageHugeFreed to HPageFreed flag Mike Kravetz
2021-01-27 10:41 ` Michal Hocko
2021-01-27 23:37 ` Mike Kravetz
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