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b=aX53b0wQlWmkYH33AjzoghCYSwYeNkKyLh2Cp0TVS8FyKpcH1FzAdekysPBs664Pr Z+xxdn25A/jB8F3TT0bdqFB9LSVjOtrfTy6XrImNMNCZ6IpoazR68QQKItXFw1jy2T DYNy39vjaVZY3RrVHkcXknODXSG7EnrDOEfO4dZw8joN8MCIExapAX7a/CzVw5/cwi BEuttzVFQN6eRUtWmbdB7BmWTUKMUbHaBUKHfsMEf7cN2RN7s7ZeByqk4o3APXbG6j +io0Su9wnO0j99Mao0ugtSJidQZ2JCMHWyQg9VX/TAGQKSKsKB+rEFoCCJp5QMLyS5 ge4yG90ZNSZaQ== From: SJ Park To: Cc: SJ Park , Andrew Morton , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [RFC PATCH 1/5] mm/damon/vaddr: support prep_probes Date: Sat, 5 Sep 2026 13:26:23 -0700 Message-ID: <20260905202634.88102-2-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260905202634.88102-1-sj@kernel.org> References: <20260905202634.88102-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam07 X-Rspamd-Queue-Id: 6A03020002 X-Stat-Signature: h8i1uzznd63digty5mwndn5pktozu7hb X-HE-Tag: 1788640005-615791 X-HE-Meta: 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 M/JhwMXR DxJ5+mdUOry5PRNnwUaU8JTa4ADx0fdvBkEkS1PcAwg+K+x/r/J3EXDheIPX8hqiREvtNygdcNcr/bzJDaetWZrB0x/OHXNCDxLdCBWMThcWyGVEdtBtzo5G5W17xChGLlrOglE4+/rZpHd5As1fWTPWNwdAAG8LnKpqroJ1YTnbgqnBVTisewVuIlGzY/aQimlQr5R7Dzd13o++E26a6FIWf4r6Y++cXE4vR0EZMzlWrY3MdTwby6bM68m1FoLAaWSNLMqgztO+5IPFrmTrCSoB8ZA== 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 prep_probes. Add the support. Signed-off-by: SJ Park --- mm/damon/vaddr.c | 40 ++++++++++++++++++++++++++++++++++++++++ 1 file changed, 40 insertions(+) diff --git a/mm/damon/vaddr.c b/mm/damon/vaddr.c index af9e1b82454cc..20f4784f17817 100644 --- a/mm/damon/vaddr.c +++ b/mm/damon/vaddr.c @@ -483,6 +483,45 @@ static unsigned int damon_va_check_accesses(struct damon_ctx *ctx) return max_nr_accesses; } +static void damon_va_prep_probe_region(struct damon_ctx *ctx, + struct mm_struct *mm, struct damon_region *r, + struct damon_probe *probe) +{ + struct damon_prep *p; + + damon_for_each_prep(p, probe) { + switch (p->action) { + case DAMON_PREP_SET_PGIDLE: + damon_va_mkold(mm, r->sampling_addr); + break; + default: + break; + } + } +} + +static void damon_va_prep_probes(struct damon_ctx *ctx, bool set_samples) +{ + struct damon_target *t; + struct mm_struct *mm; + struct damon_region *r; + struct damon_probe *p; + + damon_for_each_target(t, ctx) { + mm = damon_get_mm(t); + if (!mm) + continue; + damon_for_each_region(r, t) { + if (set_samples) + r->sampling_addr = damon_rand(ctx, r->ar.start, + r->ar.end); + damon_for_each_probe(p, ctx) + damon_va_prep_probe_region(ctx, mm, r, p); + } + mmput(mm); + } +} + 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) @@ -911,6 +950,7 @@ static int __init damon_va_initcall(void) .update = damon_va_update, .prepare_access_checks = damon_va_prepare_access_checks, .check_accesses = damon_va_check_accesses, + .prep_probes = damon_va_prep_probes, .target_valid = damon_va_target_valid, .cleanup_target = damon_va_cleanup_target, .apply_scheme = damon_va_apply_scheme, -- 2.47.3