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b=pjktQOmhx/sH0iMOwAA99wAlDyOT8OQNlWORxK6FjzzP/ORvSr1hXOhn/+yMLq389 w4khR5Rkb8j6ka5PZIyTIPS1N+f1fvek3m1RjZUdWCQiGm5Ir402sn5Fqqil6w18pN w0olg0p0PmWPcetDUap1kdx1dQ2ioLKKLQwp93a5J1z9rKEPcqtgs5PeTLm6VcPbi9 hNAh61GkRKILlus9vFvTlsXytTjwZoRhnSuwSM8r8FGl0K86MUah83xIoO93DvTiA+ QD2Oldk8qpEvdGjQvphvV6jBNtYy5P7GuwvVvyrkhTPDbcmxY5J3ruM2C6xAYyLsNN 2zD7l6+rbC6Eg== Message-ID: <7b4bf980-4ff3-4f53-8c64-1ba2d85cf1b8@kernel.org> Date: Fri, 24 Apr 2026 09:56:01 +0200 MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v1 1/3] mm: process_mrelease: expedite clean file folio reclaim via mmu_gather To: Minchan Kim , akpm@linux-foundation.org Cc: hca@linux.ibm.com, linux-s390@vger.kernel.org, mhocko@suse.com, brauner@kernel.org, linux-mm@kvack.org, linux-kernel@vger.kernel.org, surenb@google.com, timmurray@google.com, Minchan Kim References: <20260421230239.172582-1-minchan@kernel.org> <20260421230239.172582-2-minchan@kernel.org> 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-Rspamd-Queue-Id: 194E71C0010 X-Rspamd-Server: rspam07 X-Stat-Signature: 97xy1a17n6obb1fcut3d1rdhzdw9zetq X-Rspam-User: X-HE-Tag: 1777017367-222622 X-HE-Meta: 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 sdbh7Me1 Z77D2lymelaavUd1M8fBDZSzt1T8jcaxYMBVEtESD+MdcXUsQtCYsY3qpljAhjdOYRZ5sa7gkDlvqef09XzP4xeh9mOsCka8hrMoSbEOXu61IwlIGwVU7nTK5BSMp/FUjSUuVyQDG1MXcPgB9TU1g1sMlI5+MmVh3ToGeUurhojnXEHKtYAL0feBH2Wp8/HYb49vInWtGBAA9o2dFUMcPp1oFrxLKTFqk9wmDHwOTDpREPugCH1vvxCadkjf0+4ohkNROyHM95zMgrwNG3liFliIJAxagXxeGw0Isjk8ynqbZpTNGF5lvgoBYqMNKlj7f48xcuOG75CYo2fSSlJlp3L08zSeZVhj4AbbOnt18mB+gcRk= Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 4/22/26 01:02, Minchan Kim wrote: Can we make the subject easier to understand? "mm: process_mrelease: evict clean file folios when reaping a process" > Currently, process_mrelease() unmaps pages but file-backed pages are > not evicted and stay in the pagecache, relying on standard memory reclaim > (kswapd or direct reclaim) to eventually free them. This delays the > immediate recovery of system memory under Android's LMKD scenarios, > leading to redundant background apps kills. > > This patch implements an expedited eviction mechanism for clean pagecache > folios in the mmu_gather code, similar to how swapcache folios are handled. > It drops them from the pagecache (i.e., evicting them) if they are completely > unmapped during reaping. > > Within this single unified loop, anonymous pages are released via > free_swap_cache(), and file-backed folios are symmetrically released via > free_file_cache(). > > Signed-off-by: Minchan Kim > --- > arch/s390/include/asm/tlb.h | 2 +- > include/linux/swap.h | 5 ++--- > mm/mmu_gather.c | 7 ++++--- > mm/swap.c | 42 +++++++++++++++++++++++++++++++++++++ > mm/swap_state.c | 26 ----------------------- > 5 files changed, 49 insertions(+), 33 deletions(-) > > diff --git a/arch/s390/include/asm/tlb.h b/arch/s390/include/asm/tlb.h > index 619fd41e710e..2736dbb571a8 100644 > --- a/arch/s390/include/asm/tlb.h > +++ b/arch/s390/include/asm/tlb.h > @@ -62,7 +62,7 @@ static inline bool __tlb_remove_folio_pages(struct mmu_gather *tlb, > VM_WARN_ON_ONCE(delay_rmap); > VM_WARN_ON_ONCE(page_folio(page) != page_folio(page + nr_pages - 1)); > > - free_pages_and_swap_cache(encoded_pages, ARRAY_SIZE(encoded_pages)); > + free_pages_and_caches(tlb->mm, encoded_pages, ARRAY_SIZE(encoded_pages)); > return false; > } > > diff --git a/include/linux/swap.h b/include/linux/swap.h > index 62fc7499b408..bdb784966343 100644 > --- a/include/linux/swap.h > +++ b/include/linux/swap.h > @@ -414,7 +414,9 @@ extern int sysctl_min_unmapped_ratio; > extern int sysctl_min_slab_ratio; > #endif > > +struct mm_struct; > void check_move_unevictable_folios(struct folio_batch *fbatch); > +void free_pages_and_caches(struct mm_struct *mm, struct encoded_page **pages, int nr); > > extern void __meminit kswapd_run(int nid); > extern void __meminit kswapd_stop(int nid); > @@ -433,7 +435,6 @@ static inline unsigned long total_swapcache_pages(void) > > void free_swap_cache(struct folio *folio); > void free_folio_and_swap_cache(struct folio *folio); > -void free_pages_and_swap_cache(struct encoded_page **, int); > /* linux/mm/swapfile.c */ > extern atomic_long_t nr_swap_pages; > extern long total_swap_pages; > @@ -510,8 +511,6 @@ static inline void put_swap_device(struct swap_info_struct *si) > do { (val)->freeswap = (val)->totalswap = 0; } while (0) > #define free_folio_and_swap_cache(folio) \ > folio_put(folio) > -#define free_pages_and_swap_cache(pages, nr) \ > - release_pages((pages), (nr)); > > static inline void free_swap_cache(struct folio *folio) > { > diff --git a/mm/mmu_gather.c b/mm/mmu_gather.c > index fe5b6a031717..3c6c315d3c48 100644 > --- a/mm/mmu_gather.c > +++ b/mm/mmu_gather.c > @@ -100,7 +100,8 @@ void tlb_flush_rmaps(struct mmu_gather *tlb, struct vm_area_struct *vma) > */ > #define MAX_NR_FOLIOS_PER_FREE 512 > > -static void __tlb_batch_free_encoded_pages(struct mmu_gather_batch *batch) > +static void __tlb_batch_free_encoded_pages(struct mm_struct *mm, > + struct mmu_gather_batch *batch) > { > struct encoded_page **pages = batch->encoded_pages; > unsigned int nr, nr_pages; > @@ -135,7 +136,7 @@ static void __tlb_batch_free_encoded_pages(struct mmu_gather_batch *batch) > } > } > > - free_pages_and_swap_cache(pages, nr); > + free_pages_and_caches(mm, pages, nr); > pages += nr; > batch->nr -= nr; > > @@ -148,7 +149,7 @@ static void tlb_batch_pages_flush(struct mmu_gather *tlb) > struct mmu_gather_batch *batch; > > for (batch = &tlb->local; batch && batch->nr; batch = batch->next) > - __tlb_batch_free_encoded_pages(batch); > + __tlb_batch_free_encoded_pages(tlb->mm, batch); > tlb->active = &tlb->local; > } > > diff --git a/mm/swap.c b/mm/swap.c > index bb19ccbece46..e44bc8cefceb 100644 > --- a/mm/swap.c > +++ b/mm/swap.c > @@ -1043,6 +1043,48 @@ void release_pages(release_pages_arg arg, int nr) > } > EXPORT_SYMBOL(release_pages); > > +static inline void free_file_cache(struct folio *folio) > +{ > + if (folio_trylock(folio)) { > + mapping_evict_folio(folio_mapping(folio), folio); > + folio_unlock(folio); > + } > +} > + > +/* > + * Passed an array of pages, drop them all from swapcache and then release > + * them. They are removed from the LRU and freed if this is their last use. > + * > + * If @try_evict_file_folios is true, this function will proactively evict clean > + * file-backed folios if they are no longer mapped. There is no such parameter. But I do wonder if such a parameter would be better than passing in the MM here. Also, is there a way to avoid moving the function? -- Cheers, David