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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: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Queue-Id: 77356C000C X-Rspamd-Server: rspam06 X-Stat-Signature: zo55m95thewqzto51rnni11hcckaxt1p X-HE-Tag: 1753797217-603310 X-HE-Meta: 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 1kQtXjW0 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 X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: 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_target *target, return applied * PAGE_SIZE; } +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 = walk->private; + struct damos *s = priv->scheme; + unsigned long *sz_filter_passed = priv->sz_filter_passed; + struct folio *folio; + spinlock_t *ptl; + pmd_t pmde; + + ptl = pmd_lock(walk->mm, pmd); + pmde = pmdp_get(pmd); + + if (!pmd_present(pmde) || !pmd_trans_huge(pmde)) + goto unlock; + + /* Tell page walk code to not split the PMD */ + walk->action = ACTION_CONTINUE; + + folio = 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 += folio_size(folio); + } + + folio_put(folio); +update_last_applied: + s->last_applied = 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 = walk->private; + struct damos *s = priv->scheme; + unsigned long *sz_filter_passed = priv->sz_filter_passed; + struct folio *folio; + pte_t ptent; + + ptent = ptep_get(pte); + if (pte_none(ptent) || !pte_present(ptent)) + return 0; + + folio = 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 += folio_size(folio); + } + + folio_put(folio); + +update_last_applied: + s->last_applied = 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 = { + .pmd_entry = damos_va_stat_pmd_entry, + .pte_entry = damos_va_stat_pte_entry, + .walk_lock = PGWALK_RDLOCK, + }; + + priv.scheme = s; + priv.sz_filter_passed = sz_filter_passed; + + if (!damon_scheme_has_filter(s)){ + return 0; + } + + mm = 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 damon_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'. -- 2.47.3