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b=fptJiqMLnFoVvfozWpflit8hevz2h9egLe3eLwRM1ZWLB1vr1jgbNLvtmVZ9QTtNM hHIhvoTYrh6QFgcY0zExLRS5mTJLPoUF1AdSYgxZScibjbzo5C9Uda9//e3c/R3mV2 P5G81GhcCt47JWewuBi/ynEsgAgcDIediO/VqR8sKukHb+0Pq6fHdPSsddJLULPEzr KTqE5U+Par+YUVuHtG0jXimxJLGf6KssOgu67owr3sXUxpSrCDiRCjRfOn9P4GdPuO dINeqPbO6bwKPr+aAjn/JBMI08NiYSxjdJPKQz/gFrcg0oQZ+z4PmIYjnvHKuwxmE8 WHI0hCx0xzT6A== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH 3/5] mm/damon/vaddr: support apply_probe Date: Sun, 6 Sep 2026 11:44:13 -0700 Message-ID: <20260906184417.96621-4-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260906184417.96621-1-sj@kernel.org> References: <20260906184417.96621-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam08 X-Rspamd-Queue-Id: 42B82100003 X-Stat-Signature: 3tz7ehyn374g6ftdrueyad7qdu9qaacg X-Rspam-User: X-HE-Tag: 1788720266-799778 X-HE-Meta: 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 9cewNEJK s1cvIFZ7cPIuzQNEO29kKjEt6WkBLEVQqviKZi9RlJ2/35vtqhEY9+7QVNPCB1JmGRxWVzHCvSq541REcuNuEL9CQDGJgvuxhBoGhBEpy7yv38poyaNIKopDjfGSdyGKeXTNuKKNkeNg1qNTsxPbaXOEuEyLeoIO4XwytOXl21edUCY1/dZZ5VcjgsRdd1uS1lmHOF4JbP4/aYBvTcgQp3behIufPEz1Z7MbBeSYOxwGmTIv7O7qCsXeZk3L4YZXtUzZ/WxJUBfxwe0gxkrFor7FZjg== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: DAMON virtual address space operation set (vaddr) is not supporting apply_probe. Add a minimum support. Do not support hugetlb pages and PGIDLE_UNSET filter type for simplicity. Signed-off-by: SJ Park --- mm/damon/vaddr.c | 123 +++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 123 insertions(+) diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c index 20f4784f17817..7c548ec0cf6b5 100644 --- a/mm/damon/vaddr.c +++ b/mm/damon/vaddr.c @@ -522,6 +522,128 @@ static void damon_va_prep_probes(struct damon_ctx *ctx, bool set_samples) } } +static bool damon_va_filter_pass(struct folio *folio, struct damon_probe *p) +{ + struct damon_filter *f; + bool pass = true; + + damon_for_each_filter(f, p) { + if (damon_ops_filter_match(f, folio)) { + pass = f->allow; + break; + } + pass = !f->allow; + } + return pass; +} + +struct damon_va_probe_walk_private { + struct damon_ctx *ctx; + struct damon_region *r; +}; + +static void damon_va_probe_folio(struct damon_ctx *ctx, + struct damon_region *r, struct folio *folio) +{ + struct damon_probe *probe; + int i = 0; + + damon_for_each_probe(probe, ctx) { + if (damon_va_filter_pass(folio, probe)) + r->probe_hits[i]++; + i++; + } +} + +static int damon_va_probe_pmd_entry(pmd_t *pmd, unsigned long addr, + unsigned long next, struct mm_walk *walk) +{ + pte_t *pte; + pte_t ptent; + spinlock_t *ptl; + struct folio *folio; + struct damon_va_probe_walk_private *priv = walk->private; + +#ifdef CONFIG_TRANSPARENT_HUGEPAGE + ptl = pmd_trans_huge_lock(pmd, walk->vma); + if (ptl) { + pmd_t pmde = pmdp_get(pmd); + + if (!pmd_present(pmde)) + goto huge_out; + folio = vm_normal_folio_pmd(walk->vma, addr, pmde); + if (!folio) + goto huge_out; + damon_va_probe_folio(priv->ctx, priv->r, folio); + +huge_out: + spin_unlock(ptl); + return 0; + } +#endif /* CONFIG_TRANSPARENT_HUGEPAGE */ + + pte = pte_offset_map_lock(walk->mm, pmd, addr, &ptl); + if (!pte) + return 0; + ptent = ptep_get(pte); + if (!pte_present(ptent)) + goto out; + folio = vm_normal_folio(walk->vma, addr, ptent); + if (!folio) + goto out; + damon_va_probe_folio(priv->ctx, priv->r, folio); + +out: + pte_unmap_unlock(pte, ptl); + return 0; +} + +static void __damon_va_apply_probes(struct damon_ctx *ctx, + struct mm_struct *mm, struct damon_region *r) +{ + struct damon_va_probe_walk_private arg = { + .ctx = ctx, + .r = r, + }; + struct mm_walk_ops damon_probe_walk_ops = { + .pmd_entry = damon_va_probe_pmd_entry, + .hugetlb_entry = NULL, + }; + unsigned long addr = r->sampling_addr; + + if (!mm) + return; + + damon_va_walk_page_range(mm, addr, addr + 1, &damon_probe_walk_ops, + &arg); +} + +static unsigned int damon_va_apply_probes(struct damon_ctx *ctx, + bool set_samples, bool return_max_wsum) +{ + struct damon_target *t; + struct mm_struct *mm; + struct damon_region *r; + unsigned int max_wsum = 0; + + damon_for_each_target(t, ctx) { + mm = damon_get_mm(t); + damon_for_each_region(r, t) { + if (set_samples) + r->sampling_addr = damon_rand(ctx, r->ar.start, + r->ar.end); + __damon_va_apply_probes(ctx, mm, r); + if (return_max_wsum) + max_wsum = max(damon_probe_hits_wsum(r, false, + ctx), max_wsum); + } + if (mm) + mmput(mm); + } + + return max_wsum; +} + static bool damos_va_filter_young_match(struct damos_filter *filter, struct folio *folio, struct vm_area_struct *vma, unsigned long addr, pte_t *ptep, pmd_t *pmdp) @@ -951,6 +1073,7 @@ static int __init damon_va_initcall(void) .prepare_access_checks = damon_va_prepare_access_checks, .check_accesses = damon_va_check_accesses, .prep_probes = damon_va_prep_probes, + .apply_probes = damon_va_apply_probes, .target_valid = damon_va_target_valid, .cleanup_target = damon_va_cleanup_target, .apply_scheme = damon_va_apply_scheme, -- 2.47.3