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b=T7PUDJOPeIDeUK+HaqTOd3FPl/rJkFOhMFaRxejyXN6pbuQqV3u0zK+2L8+k8G5ux O5bF0ihEEAAmDxld9JxBVP8mhKuzCiLeEqVnW6l9B1ZDsY5xblGfzQtMV3WQGWxVaf CnPKCM+5ctSmQxDiM/AnVwVHuDS4Mfthom5nNPZe0NqUeyAHxBIWgJzKZN5cBoqvcc e9bqAniSXti0h181UMT/WvW1gLyy4/eOTKL4Sunn/kwcuR5Ky+6gKaX+639tKqG6wY HiVaqSVumuYFUkb7oYhzk/e54RWxTlRBi2IHRBfUV6oymiWPkgFXMx8yeNMZy/Udmp KocTzjidqb0QA== 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 08/17] mm/damon/paddr: support damon_prep Date: Sun, 26 Jul 2026 10:39:24 -0700 Message-ID: <20260726173935.94046-9-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20260726173935.94046-1-sj@kernel.org> References: <20260726173935.94046-1-sj@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Stat-Signature: 6aud4h3xfoc4aimbztbmhcm67th5544q X-Rspam-User: X-Rspamd-Server: rspam11 X-Rspamd-Queue-Id: E5BC6140004 X-HE-Tag: 1785087587-181489 X-HE-Meta: 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 Mu3axwPo TilnEC3vdBI+ysk2XFdp8yYTzicZrWjak/KbBxodZGB2RqbN+WjIJWXO/cfTK9k1AMiNoulIsYbAys4wgWqcH1DjE/lpNNj4VJwfI1j/KS6OR3eviDqrdbaBEwx/P7/JYRXCa6laKjq/tFoLNyklV+r6vgd4dZkw6DdCR0goLI/N/F1tq7fcXMb/44ff+XIDRqF0AR7fFTZ72RLXgtwhqDW47u+oWbP3X2ux1MwSfDUhJaZv3JfgSNmy8AzA0k850Tr1qkZ1rIhMkcF70oryB75YdFg== 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 199de1463fa06..8d8fcd1369e56 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) { @@ -446,6 +480,7 @@ 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