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b=HcZwPB0qrB/sK2rmHLrOG8VFxqZzdxLD+Yrt5RErfNb3SK0iwJtfGaOZXUrzvLNma XOF3Ujgi4A8RMqKAPK2Pb075WlT4Ix4xmTGxfSHxY3oIAC8EfggxNgFykJiZ4cihE4 nISmtQ6Ki/BTKWztzWUQRg0o/IRc3XFgAx+F7Hm5mxiz5m6vONdneB0axFrgf4yF/z LvclTuxEFyJJJA2sO71mCPKllk4MvwtprPvzOIGyUGdf7M+YDFEyJ3OuvXc4qvDmAS +RPMfxn3uTAdTGVWimMNfhCG3D3DCzdilmsR6SVS+LDwim0MoBfq8GaERlKd/juuzh /HGeD0r5WOZHg== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH REPOST 3/5] mm/damon/vaddr: support apply_probe Date: Wed, 9 Sep 2026 07:04:05 -0700 Message-ID: <20260909140408.104699-4-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260909140408.104699-1-sj@kernel.org> References: <20260909140408.104699-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam06 X-Rspamd-Queue-Id: 9A6BAA0007 X-Stat-Signature: gin8o9mggp95e51w759zp4rkucyi45zn X-HE-Tag: 1788962657-729396 X-HE-Meta: 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 Chv6cAU+ nT7vaM4FLskPqUWs/JE99cJCoqdDx3Lm4EM7v3NaCng0Cp7/3M2RS+Ob8O978nS1A5a2+VTS8nYnyW/1lGspLTbdFjoRGIHjvYz+QC3mL0w+aaukJlh0KVAOivm9So7jkfMjUhZ7Kz38KMxfXJl5HnL7cnF2QTbbFy4uwc7tXN1XCjiOyEiFNzUL+/4B0ic2JadLR52LpCJJkWzFm9w2MN0dvInqIrefqIo8/B7Y8D3hwbWHTMWOHUDJzdA+lXC0pqzfZTf7MJLFTST4gYM6SrNKT7g== 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