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t=1784200243; bh=jmPPDuiYXTng8WxmgDueZEPnjNUhF5XqoTiTiA+PltM=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=IME58BGp+4VoXUsAiKFtPTar/BWz6xqDCOl6H1G++hdJbXGomex8JvqFdnl5AYWFh IKpFdkzzBQx42d2q4Z+wbhDbCy79GFK99CluePEU7ywNJHcs3iah/x54b0GZzrFKA6 1LdhWEoh3Ik9uf0BpFV+iVoEQR9u0FE12zRLCZKj+pRFVmoofGNKe6zSdVNQsS4I0r BrHvm1togaouelHFOds5Xi8U5JLcI2xfLBWOVRWk1RcIAQm9iXx8/sfXOZ61WojUcw 4HV1+wsEeRB3pKr1+0GYembo0QynfBRkXlOlMvYWCqr81dtu4ucVmIMz0yQoW0xQX/ BBlIH1IZu4sfg== Message-ID: Date: Thu, 16 Jul 2026 13:10:38 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v2 2/2] mm: mglru: promote mapped executable folios after first usage To: Baolin Wang , akpm@linux-foundation.org, ljs@kernel.org, hannes@cmpxchg.org Cc: riel@surriel.com, liam@infradead.org, vbabka@kernel.org, harry@kernel.org, jannh@google.com, lance.yang@linux.dev, kasong@tencent.com, qi.zheng@linux.dev, shakeel.butt@linux.dev, baohua@kernel.org, axelrasmussen@google.com, yuanchu@google.com, weixugc@google.com, mhocko@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org References: <7e3a5f6bdf70e0237027025f4593a3874d411f65.1784197559.git.baolin.wang@linux.alibaba.com> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 7bit X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: 2CB7FC0011 X-Stat-Signature: 1319pioa6s31gffrimcitsua1p4s6xdf X-HE-Tag: 1784200244-5477 X-HE-Meta: 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 KbK3r/z1 qMS/2WwWmXkhAhrA7RlkPq97o1pgr0wg/d6pC9yw2j0769hBLhoO3EyrL6YW5FV9veUB6ATeamaQJ6ujMArrcvtbv6g66u4wszOtc6sHQUweZRxKT7kjHScCEyas5fW8xWYw93n+udIXkgP0i2oFakFWKrLJNaTL9M86J4wnorU6TUi/HelHGD06GZkywOPxzNPVs2IcBSGDujV5yGwN2UpcEebtgKRa0U0zd8+lVq4E9NTDmN44Nf6ey2gIljNrRzfDAch4j2Pf7X1zgqZPmqriE8T2YCQFncGys Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 7/16/26 12:46, Baolin Wang wrote: > Classical LRU protects mapped executable file folios through commit > 8cab4754d24a0 ("vmscan: make mapped executable pages the first class > citizen") and commit c909e99364c8 ("vmscan: activate executable pages > after first usage"), giving executable code a better chance to stay in > memory, avoiding IO thrashing and improving workload performance. > > However, MGLRU's protection of mapped executable file folios is less > reliable. Although shrink_folio_list() checks references, the access flag > of mapped executable file folios may have already been checked and > cleared by lru_gen_look_around() or walk_mm(). Additionally, > folio_update_gen() or lru_gen_set_refs() only sets the 'PG_referenced' > flag for mapped executable file folios, which causes shrink_folio_list() > to ignore the first usage of these mapped executable file folios and > reclaim them easily. > > Follow the classical LRU's logic, promoting mapped executable file folios > after their first usage in folio_update_gen() and lru_gen_set_refs(), > giving executable code a better chance to stay in memory. > > On my 32-core Arm machine, with the memcg limit set to 2G, running > 'make -j32' to build kernel showed some improvement in sys time. > > base patched > 9248.543s 7861.579s > > Signed-off-by: Baolin Wang > --- > include/linux/mm_inline.h | 6 ++++++ > mm/vmscan.c | 41 ++++++++++++++++++++++++--------------- > 2 files changed, 31 insertions(+), 16 deletions(-) > > diff --git a/include/linux/mm_inline.h b/include/linux/mm_inline.h > index b5c4dc0f3fe3..30fdf1056312 100644 > --- a/include/linux/mm_inline.h > +++ b/include/linux/mm_inline.h > @@ -30,6 +30,12 @@ static inline int folio_is_file_lru(const struct folio *folio) > return !folio_test_swapbacked(folio); > } > > +static inline bool folio_is_exec_file(const struct folio *folio, > + const vma_flags_t *vma_flags) > +{ > + return vma_flags_test(vma_flags, VMA_EXEC_BIT) && folio_is_file_lru(folio); > +} I don't quite like a generic folio_is* helper to consume vma flags. Whether it is executable depends on the VMA. When called from a non-exec VMA it would just give a wrong answer. Not sure if something like "is_executable_file_folio()"/"is_exec_file_folio" would be better, to distinguish from the actualy folio_is* helpers that are independent of context. Also, can this helper just go to vmscan.c? -- Cheers, David