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Tue, 29 Jul 2025 06:53:33 -0700 (PDT) From: Yueyang Pan To: SeongJae Park , Andrew Morton , Usama Arif Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, PanJason Subject: [PATCH v1 1/2] mm/damon: Move invalid folio and has filter to ops-common Date: Tue, 29 Jul 2025 06:53:29 -0700 Message-ID: <2e143ff5789954b2c3c5b97b12569bc324cff087.1753794408.git.pyyjason@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: PanJason This patch moves the damon_pa_invalid_damos_folio and damon_pa_scheme_has_filter to ops-common. renaming them to damon_invalid_damos_folio and damon_scheme_has_filter. Doing so allows us to reuse their logic in the vaddr version of DAMOS_STAT --- mm/damon/ops-common.c | 19 +++++++++++++++++++ mm/damon/ops-common.h | 3 +++ mm/damon/paddr.c | 29 +++++------------------------ 3 files changed, 27 insertions(+), 24 deletions(-) diff --git a/mm/damon/ops-common.c b/mm/damon/ops-common.c index 99321ff5cb92..7d3b48cc0f86 100644 --- a/mm/damon/ops-common.c +++ b/mm/damon/ops-common.c @@ -412,3 +412,22 @@ unsigned long damon_migrate_pages(struct list_head *fo= lio_list, int target_nid) =20 return nr_migrated; } + +bool damon_scheme_has_filter(struct damos *s) +{ + struct damos_filter *f; + damos_for_each_ops_filter(f, s) + return true; + return false; +} + +bool damon_invalid_damos_folio(struct folio *folio, struct damos *s) +{ + if (!folio) + return true; + if (folio =3D=3D s->last_applied) { + folio_put(folio); + return true; + } + return false; +} diff --git a/mm/damon/ops-common.h b/mm/damon/ops-common.h index 61ad54aaf256..4e905477fdce 100644 --- a/mm/damon/ops-common.h +++ b/mm/damon/ops-common.h @@ -21,3 +21,6 @@ int damon_hot_score(struct damon_ctx *c, struct damon_reg= ion *r, =20 bool damos_folio_filter_match(struct damos_filter *filter, struct folio *f= olio); unsigned long damon_migrate_pages(struct list_head *folio_list, int target= _nid); + +bool damon_scheme_has_filter(struct damos *s); +bool damon_invalid_damos_folio(struct folio *folio, struct damos *s); diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index 53a55c5114fb..a8b7048e871e 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -114,16 +114,6 @@ static bool damos_pa_filter_out(struct damos *scheme, = struct folio *folio) return scheme->ops_filters_default_reject; } =20 -static bool damon_pa_invalid_damos_folio(struct folio *folio, struct damos= *s) -{ - if (!folio) - return true; - if (folio =3D=3D s->last_applied) { - folio_put(folio); - return true; - } - return false; -} =20 static unsigned long damon_pa_pageout(struct damon_region *r, struct damos= *s, unsigned long *sz_filter_passed) @@ -152,7 +142,7 @@ static unsigned long damon_pa_pageout(struct damon_regi= on *r, struct damos *s, addr =3D r->ar.start; while (addr < r->ar.end) { folio =3D damon_get_folio(PHYS_PFN(addr)); - if (damon_pa_invalid_damos_folio(folio, s)) { + if (damon_invalid_damos_folio(folio, s)) { addr +=3D PAGE_SIZE; continue; } @@ -192,7 +182,7 @@ static inline unsigned long damon_pa_mark_accessed_or_d= eactivate( addr =3D r->ar.start; while (addr < r->ar.end) { folio =3D damon_get_folio(PHYS_PFN(addr)); - if (damon_pa_invalid_damos_folio(folio, s)) { + if (damon_invalid_damos_folio(folio, s)) { addr +=3D PAGE_SIZE; continue; } @@ -239,7 +229,7 @@ static unsigned long damon_pa_migrate(struct damon_regi= on *r, struct damos *s, addr =3D r->ar.start; while (addr < r->ar.end) { folio =3D damon_get_folio(PHYS_PFN(addr)); - if (damon_pa_invalid_damos_folio(folio, s)) { + if (damon_invalid_damos_folio(folio, s)) { addr +=3D PAGE_SIZE; continue; } @@ -262,28 +252,19 @@ static unsigned long damon_pa_migrate(struct damon_re= gion *r, struct damos *s, return applied * PAGE_SIZE; } =20 -static bool damon_pa_scheme_has_filter(struct damos *s) -{ - struct damos_filter *f; - - damos_for_each_ops_filter(f, s) - return true; 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Tue, 29 Jul 2025 06:53:35 -0700 (PDT) Received: from localhost ([2a03:2880:31ff:4c::]) by smtp.gmail.com with ESMTPSA id ffacd0b85a97d-3b778ebaca7sm12658402f8f.30.2025.07.29.06.53.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 29 Jul 2025 06:53:35 -0700 (PDT) From: Yueyang Pan To: SeongJae Park , Andrew Morton , Usama Arif Cc: damon@lists.linux.dev, linux-mm@kvack.org, linux-kernel@vger.kernel.org, PanJason Subject: [PATCH v1 2/2] mm/damon: Add damos_stat support for vaddr Date: Tue, 29 Jul 2025 06:53:30 -0700 Message-ID: <44a30f700fdcf4470318ef5cd248ba98c59b77a2.1753794408.git.pyyjason@gmail.com> X-Mailer: git-send-email 2.47.3 In-Reply-To: References: Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: PanJason This patch adds support for damos_stat in virtual address space. It leverages the walk_page_range to walk the page table and gets the folio from page table. The last folio scanned is stored in damos->last_applied to prevent double counting. --- mm/damon/vaddr.c | 113 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 112 insertions(+), 1 deletion(-) diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c index 87e825349bdf..3e319b51cfd4 100644 --- a/mm/damon/vaddr.c +++ b/mm/damon/vaddr.c @@ -890,6 +890,117 @@ static unsigned long damos_va_migrate(struct damon_ta= rget *target, return applied * PAGE_SIZE; } =20 +struct damos_va_stat_private { + struct damos *scheme; + unsigned long *sz_filter_passed; +}; + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE +static int damos_va_stat_pmd_entry(pmd_t *pmd, unsigned long addr, + unsigned long next, struct mm_walk *walk) +{ + struct damos_va_stat_private *priv =3D walk->private; + struct damos *s =3D priv->scheme; + unsigned long *sz_filter_passed =3D priv->sz_filter_passed; + struct folio *folio; + spinlock_t *ptl; + pmd_t pmde; + + ptl =3D pmd_lock(walk->mm, pmd); + pmde =3D pmdp_get(pmd); + + if (!pmd_present(pmde) || !pmd_trans_huge(pmde)) + goto unlock; + + /* Tell page walk code to not split the PMD */ + walk->action =3D ACTION_CONTINUE; + + folio =3D damon_get_folio(pmd_pfn(pmde)); + if (!folio) + goto unlock; + + if (damon_invalid_damos_folio(folio, s)) + goto update_last_applied; + + if (!damos_va_filter_out(s, folio, walk->vma, addr, NULL, pmd)){ + *sz_filter_passed +=3D folio_size(folio); + } + + folio_put(folio); +update_last_applied: + s->last_applied =3D folio; +unlock: + spin_unlock(ptl); + return 0; +} +#else +#define damon_va_stat_pmd_entry NULL +#endif + +static int damos_va_stat_pte_entry(pte_t *pte, unsigned long addr, + unsigned long next, struct mm_walk *walk) +{ + struct damos_va_stat_private *priv =3D walk->private; + struct damos *s =3D priv->scheme; + unsigned long *sz_filter_passed =3D priv->sz_filter_passed; + struct folio *folio; + pte_t ptent; + + ptent =3D ptep_get(pte); + if (pte_none(ptent) || !pte_present(ptent)) + return 0; + + folio =3D damon_get_folio(pte_pfn(ptent)); + if (!folio) + return 0; + + if (damon_invalid_damos_folio(folio, s)) + goto update_last_applied; + + if (!damos_va_filter_out(s, folio, walk->vma, addr, pte, NULL)){ + *sz_filter_passed +=3D folio_size(folio); + } + + folio_put(folio); + +update_last_applied: + s->last_applied =3D folio; + return 0; +} + +static unsigned long damos_va_stat(struct damon_target *target, + struct damon_region *r, struct damos *s, + unsigned long *sz_filter_passed) +{ + + struct damos_va_stat_private priv; + struct mm_struct *mm; + struct mm_walk_ops walk_ops =3D { + .pmd_entry =3D damos_va_stat_pmd_entry, + .pte_entry =3D damos_va_stat_pte_entry, + .walk_lock =3D PGWALK_RDLOCK, + }; + + priv.scheme =3D s; + priv.sz_filter_passed =3D sz_filter_passed; + + if (!damon_scheme_has_filter(s)){ + return 0; + } + + mm =3D damon_get_mm(target); + if (!mm) + return 0; + + mmap_read_lock(mm); + walk_page_range(mm, r->ar.start, r->ar.end, &walk_ops, &priv); + mmap_read_unlock(mm); + mmput(mm); + pr_debug("Call va_stat: %lu\n", *sz_filter_passed); + return 0; + +} + static unsigned long damon_va_apply_scheme(struct damon_ctx *ctx, struct damon_target *t, struct damon_region *r, struct damos *scheme, unsigned long *sz_filter_passed) @@ -916,7 +1027,7 @@ static unsigned long damon_va_apply_scheme(struct damo= n_ctx *ctx, case DAMOS_MIGRATE_COLD: return damos_va_migrate(t, r, scheme, sz_filter_passed); case DAMOS_STAT: - return 0; + return damos_va_stat(t, r, scheme, sz_filter_passed); default: /* * DAMOS actions that are not yet supported by 'vaddr'. --=20 2.47.3