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b=amygPIRtCamOEChxFe6EU72WlaHv1AGk8cE4BcJs/D2pvz4gG8DnhfNrZGQ79M9hf EPeISk5p3+OwZvXTqEFE9jS9dPAebeYlaXnIOiyoHJT9/3DLiOZTHgYYOroAg8cn7G zs1/7WCgJ5KltZFn2wgvgvLE1jjmexlDohrEAAcme7h3v3XOGGAzt86m6bpA5iBzpn KRqt+F+AYR7GbCSzzsag3rWWV6c1TO289VU7RqcLKUZrH9dZ/hb7jGCBkbWz5rHnTo CzOg7xc13ImIL22vADZuFPfif8AUhihNp2z/gT3AyLV5vWlMnRYoR8EgbUXmABRjrx yWEW+C6tpRZmA== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v1.1 08/17] mm/damon/paddr: support damon_prep Date: Tue, 1 Sep 2026 06:24:55 -0700 Message-ID: <20260901132506.99243-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260901132506.99243-1-sj@kernel.org> References: <20260901132506.99243-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Rspam-User: X-Rspamd-Server: rspam01 X-Rspamd-Queue-Id: 6B6CE140011 X-Stat-Signature: mc7fm3mb5ue5q7874qaqjebb3j813isx X-HE-Tag: 1788269118-329488 X-HE-Meta: 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 m2fFQkcI cwO/Sd0TE+SmX8lyH06bNddgc358XtCbO8njxLRKluNPdiYX6BWOc5cPN4X6nvQ3b5zpVC/ggy780xpBxt49qyKjWsHF0MYRw+BxxVI4QFGOj4qNaePSvCLq0LGpZ/R+q24anA6EI6hIVgXIPtwYxWT+82Wb+qz1ZhD1t/lzH47acwWHlZ/rK6OTydJ+IaI1Gv1+vkHJwN1t7EguZIRSrEWuk5TBJrC2s1IPJgR4tZpblrp/PVMUkp4Z2jMc70sLgTql1QUxxtt2MpboLa1u7cjVyag== 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 6f756f8493894..c1e7d7a4f40df 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