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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