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bh=dLFzt3EcCEm4IM9i5M5f2Ly9bLRqeWPD/3m4Jo0md2U=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=oglScrxwVAH88y6Ax7Ax7nnGkpy9HeysXFQJDjpvqI5IlUIlekaEm1w+D89X0wbo+ 78qaNFDrd5Bu6wYCq2Zo6xQv0qz0BHqSjTGf5CK5q4aHDYIa3Ub766rcZbtMwCqJLD pv4RZcD2mI3Kb2snc/TrF7MDTGBchgaDC7FCgmcLQDV1YIwxnVqTJfl1JBUpYFEk2x Qyxz6tPo6aDHVfPXjC1N1QCPrWtz2fkChF8U0Ky3T0AD7b9Qv4UDAPBv4pjaZmpJR3 r6JvlwMTGkah/JYwA34QKcw6KzXEYLC4ROhNuADZZ4iVBdv9FLFGdZKRoWieN2jn3l 0TkHeM0TtIqUQ== 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 v2.2 08/17] mm/damon/paddr: support damon_prep Date: Mon, 27 Jul 2026 21:12:29 -0700 Message-ID: <20260728041242.187380-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260728041242.187380-1-sj@kernel.org> References: <20260728041242.187380-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspamd-Server: rspam12 X-Rspamd-Queue-Id: 8E7E7C0008 X-Stat-Signature: ei4jwx8c66yrkoqhst1hd6xcyqycg46m X-Rspam-User: X-HE-Tag: 1785211975-836570 X-HE-Meta: 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 /F9WnMrp UQWsl2AxPUrka7+oI9Hb4XJ6Cihj8QU2dPVIQ4/NhBBWCl1gSNbM7L7lNwUOU9dzWst93B21m3DOm3Awyv+UYlEAAXcaLiwAKYlEGRdk32c37FUkeAo+v8momZb+NGP+/xRqIwfb11XgBX76yrzr9c2kOB0ntMq82ENKk4TOZPgowcyGW+66/TNGzGk1s6ojU/i5rwANuR4gwLjHcgN5NQDlYpBPI9Dn1y9N6IW+wswBBRyA4EZxNVdqKS6sv5MOTYFjIe+7jaaCFQm3SGmfPq2siEw== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: Implement damon_operations->prep_probes() callback. Support the only existing prep action, DAMON_PREP_SET_PGIDLE in a way similar to what it was doing for the access check preparation: unset page table accessed bits and set PG_Idle flag. Reuse the function for the access check preparation. Signed-off-by: SJ Park --- mm/damon/paddr.c | 35 +++++++++++++++++++++++++++++++++++ 1 file changed, 35 insertions(+) diff --git a/mm/damon/paddr.c b/mm/damon/paddr.c index 5b307dcbb2a50..8fb71183b76c0 100644 --- a/mm/damon/paddr.c +++ b/mm/damon/paddr.c @@ -105,6 +105,40 @@ static unsigned int damon_pa_check_accesses(struct damon_ctx *ctx) return max_nr_accesses; } +static void damon_pa_prep_probes_region(struct damon_region *r, + struct damon_probe *probe, struct damon_ctx *ctx) +{ + struct damon_prep *p; + + damon_for_each_prep(p, probe) { + switch (p->action) { + case DAMON_PREP_SET_PGIDLE: + damon_pa_mkold(damon_pa_phys_addr(r->sampling_addr, + ctx->addr_unit)); + break; + default: + break; + } + } +} + +static void damon_pa_prep_probes(struct damon_ctx *ctx, bool set_samples) +{ + struct damon_target *t; + struct damon_region *r; + struct damon_probe *p; + + damon_for_each_target(t, ctx) { + 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_pa_prep_probes_region(r, p, ctx); + } + } +} + static bool damon_pa_filter_match(struct damon_filter *filter, struct folio *folio) { @@ -448,6 +482,7 @@ static int __init damon_pa_initcall(void) .update = NULL, .prepare_access_checks = damon_pa_prepare_access_checks, .check_accesses = damon_pa_check_accesses, + .prep_probes = damon_pa_prep_probes, .apply_probes = damon_pa_apply_probes, .target_valid = NULL, .apply_scheme = damon_pa_apply_scheme, -- 2.47.3