From: "Kirill A. Shutemov" <kirill@shutemov.name>
To: Konstantin Khlebnikov <khlebnikov@yandex-team.ru>
Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com>,
Andrew Morton <akpm@linux-foundation.org>,
Andrea Arcangeli <aarcange@redhat.com>,
Hugh Dickins <hughd@google.com>,
Dave Hansen <dave.hansen@intel.com>, Mel Gorman <mgorman@suse.de>,
Rik van Riel <riel@redhat.com>, Vlastimil Babka <vbabka@suse.cz>,
Christoph Lameter <cl@gentwo.org>,
Naoya Horiguchi <n-horiguchi@ah.jp.nec.com>,
Steve Capper <steve.capper@linaro.org>,
"Aneesh Kumar K.V" <aneesh.kumar@linux.vnet.ibm.com>,
Johannes Weiner <hannes@cmpxchg.org>,
Michal Hocko <mhocko@suse.cz>,
Jerome Marchand <jmarchan@redhat.com>,
Sasha Levin <sasha.levin@oracle.com>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org
Subject: Re: [PATCH 03/16] page-flags: introduce page flags policies wrt compound pages
Date: Mon, 28 Sep 2015 14:03:05 +0300 [thread overview]
Message-ID: <20150928110305.GA4721@node> (raw)
In-Reply-To: <5609102B.5020704@yandex-team.ru>
On Mon, Sep 28, 2015 at 01:02:19PM +0300, Konstantin Khlebnikov wrote:
> On 25.09.2015 22:13, Kirill A. Shutemov wrote:
> >On Fri, Sep 25, 2015 at 03:29:17PM +0300, Konstantin Khlebnikov wrote:
> >>On 24.09.2015 17:50, Kirill A. Shutemov wrote:
> >>>This patch adds a third argument to macros which create function
> >>>definitions for page flags. This argument defines how page-flags helpers
> >>>behave on compound functions.
> >>>
> >>>For now we define four policies:
> >>>
> >>>- PF_ANY: the helper function operates on the page it gets, regardless
> >>> if it's non-compound, head or tail.
> >>>
> >>>- PF_HEAD: the helper function operates on the head page of the compound
> >>> page if it gets tail page.
> >>>
> >>>- PF_NO_TAIL: only head and non-compond pages are acceptable for this
> >>> helper function.
> >>>
> >>>- PF_NO_COMPOUND: only non-compound pages are acceptable for this helper
> >>> function.
> >>>
> >>>For now we use policy PF_ANY for all helpers, which matches current
> >>>behaviour.
> >>>
> >>>We do not enforce the policy for TESTPAGEFLAG, because we have flags
> >>>checked for random pages all over the kernel. Noticeable exception to
> >>>this is PageTransHuge() which triggers VM_BUG_ON() for tail page.
> >>>
> >>>Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
> >>>---
> >>> include/linux/page-flags.h | 154 ++++++++++++++++++++++++++-------------------
> >>> 1 file changed, 90 insertions(+), 64 deletions(-)
> >>>
> >>>diff --git a/include/linux/page-flags.h b/include/linux/page-flags.h
> >>>index 713d3f2c2468..1b3babe5ff69 100644
> >>>--- a/include/linux/page-flags.h
> >>>+++ b/include/linux/page-flags.h
> >>>@@ -154,49 +154,68 @@ static inline int PageCompound(struct page *page)
> >>> return test_bit(PG_head, &page->flags) || PageTail(page);
> >>> }
> >>>
> >>>+/* Page flags policies wrt compound pages */
> >>>+#define PF_ANY(page, enforce) page
> >>>+#define PF_HEAD(page, enforce) compound_head(page)
> >>>+#define PF_NO_TAIL(page, enforce) ({ \
> >>>+ if (enforce) \
> >>>+ VM_BUG_ON_PAGE(PageTail(page), page); \
> >>>+ else \
> >>>+ page = compound_head(page); \
> >>>+ page;})
> >>>+#define PF_NO_COMPOUND(page, enforce) ({ \
> >>>+ if (enforce) \
> >>>+ VM_BUG_ON_PAGE(PageCompound(page), page); \
> >>
> >>Linux next-20150925 crashes here (at least in lkvm)
> >>if CONFIG_DEFERRED_STRUCT_PAGE_INIT=y
> >
> >Hm. I don't see the crash in qemu. Could you share your config?
>
> see in attachment
Still don't see it. Have you tried patch from my previous mail?
--
Kirill A. Shutemov
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next prev parent reply other threads:[~2015-09-28 11:03 UTC|newest]
Thread overview: 34+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20150921153509.fef7ecdf313ef74307c43b65@linux-foundation.org>
2015-09-24 14:50 ` [PATCH 00/16] Refreshed page-flags patchset Kirill A. Shutemov
2015-09-24 14:50 ` [PATCH 01/16] page-flags: trivial cleanup for PageTrans* helpers Kirill A. Shutemov
2015-09-24 15:44 ` Christoph Lameter
2015-09-24 14:50 ` [PATCH 02/16] page-flags: move code around Kirill A. Shutemov
2015-09-24 14:50 ` [PATCH 03/16] page-flags: introduce page flags policies wrt compound pages Kirill A. Shutemov
2015-09-25 12:29 ` Konstantin Khlebnikov
2015-09-25 19:13 ` Kirill A. Shutemov
2015-09-28 10:02 ` Konstantin Khlebnikov
2015-09-28 11:03 ` Kirill A. Shutemov [this message]
2015-09-28 11:48 ` Konstantin Khlebnikov
2015-09-28 17:51 ` Kirill A. Shutemov
2015-09-24 14:50 ` [PATCH 04/16] page-flags: define PG_locked behavior on " Kirill A. Shutemov
2015-09-24 16:08 ` Christoph Lameter
2015-09-24 20:26 ` Kirill A. Shutemov
2015-09-24 14:50 ` [PATCH 05/16] page-flags: define behavior of FS/IO-related flags " Kirill A. Shutemov
2015-09-24 14:50 ` [PATCH 06/16] page-flags: define behavior of LRU-related " Kirill A. Shutemov
2015-09-24 14:50 ` [PATCH 07/16] page-flags: define behavior SL*B-related " Kirill A. Shutemov
2015-09-24 14:50 ` [PATCH 08/16] page-flags: define behavior of Xen-related " Kirill A. Shutemov
2015-09-24 14:50 ` [PATCH 09/16] page-flags: define PG_reserved behavior " Kirill A. Shutemov
2015-09-24 14:50 ` [PATCH 10/16] page-flags: define PG_swapbacked " Kirill A. Shutemov
2015-09-24 14:50 ` [PATCH 11/16] page-flags: define PG_swapcache " Kirill A. Shutemov
2015-09-24 14:51 ` [PATCH 12/16] page-flags: define PG_mlocked " Kirill A. Shutemov
2016-04-18 19:44 ` Sasha Levin
2016-05-18 14:02 ` Kirill A. Shutemov
2015-09-24 14:51 ` [PATCH 13/16] page-flags: define PG_uncached " Kirill A. Shutemov
2015-09-24 14:51 ` [PATCH 14/16] page-flags: define PG_uptodate " Kirill A. Shutemov
2015-09-24 14:51 ` [PATCH 15/16] page-flags: look at head page if the flag is encoded in page->mapping Kirill A. Shutemov
2015-09-24 14:51 ` [PATCH 16/16] mm: sanitize page->mapping for tail pages Kirill A. Shutemov
2015-09-25 2:20 ` Jerome Glisse
2015-09-24 16:13 ` [PATCH 00/16] Refreshed page-flags patchset Christoph Lameter
2015-09-24 20:25 ` Kirill A. Shutemov
2015-03-19 17:08 [PATCH 00/16] Sanitize usage of ->flags and ->mapping for tail pages Kirill A. Shutemov
2015-03-19 17:08 ` [PATCH 03/16] page-flags: introduce page flags policies wrt compound pages Kirill A. Shutemov
2015-03-20 20:35 ` Andrew Morton
2015-03-20 21:34 ` Kirill A. Shutemov
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