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Wed, 30 Jul 2025 10:20:01 -0700 (PDT) Received: from localhost ([2a03:2880:31ff:74::]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-45895377ae2sm33277545e9.12.2025.07.30.10.20.01 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 30 Jul 2025 10:20:01 -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 Subject: [PATCH v2 2/2] mm/damon: Add damos_stat support for vaddr Date: Wed, 30 Jul 2025 10:19:56 -0700 Message-ID: X-Mailer: git-send-email 2.47.3 In-Reply-To: References: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 981y1fgheofb9mdwi87s9iufpr8gupfq X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 4E16A14000B X-Rspam-User: X-HE-Tag: 1753896003-709120 X-HE-Meta: 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 tnB43KEx GCAwX7P+HL0O341YcwbIoSUQNQV3er/B3f2bO6hUrnJlaM/amx2272VupP/AnUc8m0uGEldz0lLT02mc9BYulDNewanitfs5vb/Lo0pwvDhVAMEuhccKXWhZ/1A/V3GOdtEekqk7E5q/5oFB+dIQhAkLJ6I48jsvBRQtRJekvbFlMu2+ovSx2RukafolM/xNxuz+/joKATxo4IHhqvJ42Vb0SPSEeHM7m563uzA5xAstd86wWF3sM2YUJVgL1FdR7HNRA3Vaq0sgDPGvV+4NPjOiSDRTWE/TCpto+JjWzZcIE44PU3BtSG82LdDNBGEkC1geTCKpMW8T18sVpR9oX999LOH3+kT0jUlyoyCjX7N4G2rn/Bf+njbe0XrtnachvQwc6f7VGoU4mFZ8WvBkzHsffrZuBET0NcnlgxzrAS1pgvFoqpc0cC7U0xB+iQ9uXKvM1lY3LoATZ9ce3vyKH8fMjd7F8hkvGdD3ZSQStpaQn0+rg5gsf+wxBNBVanOBOoun7SkXZje2QxMb/hgMWs6RO2CKQsouK7YaO 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: 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. Signed-off-by: Yueyang Pan --- mm/damon/vaddr.c | 105 ++++++++++++++++++++++++++++++++++++++++++++++- 1 file changed, 104 insertions(+), 1 deletion(-) diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c index 87e825349bdf..6ed919e817e2 100644 --- a/mm/damon/vaddr.c +++ b/mm/damon/vaddr.c @@ -890,6 +890,109 @@ 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; +}; + +static inline bool damon_va_invalid_damos_folio(struct folio *folio, struct damos *s) +{ + return !folio || folio == s->last_applied; +} + +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 vm_area_struct *vma = walk->vma; + struct folio *folio; + spinlock_t *ptl; + pte_t *start_pte, *pte, ptent; + int nr; + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + if (pmd_trans_huge(*pmd)) { + pmd_t pmde; + + ptl = pmd_trans_huge_lock(pmd, vma); + if (!ptl) + return 0; + pmde = pmdp_get(pmd); + if (!pmd_present(pmde)) + goto huge_unlock; + + folio = vm_normal_folio_pmd(vma, addr, pmde); + + if (damon_va_invalid_damos_folio(folio, s)) + goto huge_unlock; + + if (!damos_va_filter_out(s, folio, vma, addr, NULL, pmd)) + *sz_filter_passed += folio_size(folio); + s->last_applied = folio; + +huge_unlock: + spin_unlock(ptl); + return 0; + } +#endif + start_pte = pte = pte_offset_map_lock(vma->vm_mm, pmd, addr, &ptl); + if (!start_pte) + return 0; + + for (; addr < next; pte += nr, addr += nr * PAGE_SIZE) { + nr = 1; + ptent = ptep_get(pte); + + if (pte_none(ptent) || !pte_present(ptent)) + continue; + + folio = vm_normal_folio(vma, addr, ptent); + + if (damon_va_invalid_damos_folio(folio, s)) + continue; + + if (!damos_va_filter_out(s, folio, vma, addr, pte, NULL)) + *sz_filter_passed += folio_size(folio); + nr = folio_nr_pages(folio); + s->last_applied = folio; + } + + pte_unmap_unlock(start_pte, ptl); + + 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, + .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); + 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 +1019,7 @@ 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