From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1793930767; b=MiQx7ZSIwJp6Ns3PCsI/cY9Kx0H50NNyuNbRwI4EHNt4TXyyWxlCdqbIGKPUYnVLSYRU qqQnyF+pSOMA85j7Od5sagM1ItXbqqfkUREmzTYi/Y3T9IB75OwYj4ead4gm4xNYAf+x6 bD/SHC2I2tvlGf6C3n05w3nVkX8nZFVTMmWVDU2Hg/CdFN3X8sOCRS1WULR7/7X/fiQ3u Ya2vVs92wxH/hv1uaLGEp5yQV5CUgSPwfP8nQVHx0ShV9CN3e+Ms3BxZ7skVM1Ouwbu6k zNNQhgdlpke8FmcXSXZwf4yg6fTM+mpyyxciSFwbLUM7kgLPGDvPo8N9xZyV1hL1DDg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1793930767; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:MIME-Version:Content-Transfer-Encoding; bh=33k/P5SFUfytPej7H77BAGZq9RIshANAPOsnx9OCzY0=; b=tKOHH0pWuxq5ft8K87EX05UZi+x2dncKBM3reg0UvTVU2+XO3mp63nuFqGUyMF7l9LR8 5fLo3fbUL5EhCgD6U/9nGSIEBv2meI4bLPLGpiS2j2/nW5iLCs8hMFCaDi0Z4BEFlKitx zK2EGfvxfhEFH7dmlFawVFYlB2uYX8U3ByJ8Ws1eMKuybJwClGQqnCd0EMbAVMBEaW2Cc jkVCe1uzf7aLxWnAzOjeJO15zIaViewcRYBMv0sb8l1qhNr0jHsIlkHBwljv43RNGclnw Xlyy/o3AdnEJpu5lJgQgskE4nDFlqY37CAMHe+pXOt4/oL94cM27FuPk/wHc37pOS8A== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=JgXUvtLp; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 52ADE606A326; Fri, 6 Nov 2026 02:06:07 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key, unprotected) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=JgXUvtLp Received: by smtp.kernel.org (Postfix) with ESMTPSA id E8C461F008A2; Fri, 6 Nov 2026 02:06:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1793930767; bh=33k/P5SFUfytPej7H77BAGZq9RIshANAPOsnx9OCzY0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=JgXUvtLpeaDJ5faRXg+ycd+p3SN66fZtkXH6+vfvMFQksU2hm4UKSTkuMEeQ6cu0o uidSPb+aN8cPaNo0DnPlx/qTCWTd7Qreo3yCMTbaobgwlGf9k1cmd/U9sfcaC+bs1S 0YP3E13ViqO/t/4xUNN1GXVd/RWBReJPAZDu1kK02sO/4Q27GCqgcnmiwWBTjkflbC VFLv0TJ0SYKCQ80DUZ47CUZ2zRUFydTuCggjs0A3PI/gSYYnXBk5NWef28+uSUwm31 zCt+UPkGL8dSCgI6ntFCvb9mHMVbRDuZFW/wEJzZTZNAoVOT9l6AX71jXc4Y00zsT/ Dtqk7G5lDYm1Q== From: SJ Park To: Andrew Morton Cc: SJ Park , damon@lists.linux.dev, linux-kernel@vger.kernel.org, linux-mm@kvack.org, Aveline Noir Subject: [PATCH 1/4] mm/damon/core: add DAMOS_FILTER_TYPE_AGE_MS Date: Thu, 5 Nov 2026 18:05:55 -0800 Message-ID: <20261106020559.98352-2-sj@kernel.org> X-Mailer: git-send-email 2.47.3 In-Reply-To: <20261106020559.98352-1-sj@kernel.org> References: <20261106020559.98352-1-sj@kernel.org> X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit There is no way to specify DAMOS target regions with a deterministic time based age range. Extend DAMOS core filter to specify target regions with age in milliseconds. Introduce new damos_filter_type, DAMOS_FILTER_TYPE_AGE_MS in DAMON API, and implement support of the type in the core layer. Convert the age in aggregation intervals to milliseconds and use it when the filter is evaluated. Reuse damos_filter->range_{min,max} to save the age range. Reviewed-by: Aveline Noir Signed-off-by: SJ Park --- include/linux/damon.h | 16 ++++++++++------ mm/damon/core.c | 10 +++++++++- 2 files changed, 19 insertions(+), 7 deletions(-) diff --git a/include/linux/damon.h b/include/linux/damon.h index 380f9cf6ddd82..1302ffb6f0bcb 100644 --- a/include/linux/damon.h +++ b/include/linux/damon.h @@ -394,13 +394,16 @@ struct damos_stat { * @DAMOS_FILTER_TYPE_ADDR: Address range. * @DAMOS_FILTER_TYPE_TARGET: Data Access Monitoring target. * @DAMOS_FILTER_TYPE_PROBE_HITS_WSUM: probe_hits weighted sum range. + * @DAMOS_FILTER_TYPE_AGE_MS: Region age range in milliseconds. * - * All types except &DAMOS_FILTER_TYPE_ADDR, &DAMOS_FILTER_TYPE_TARGET and - * &DAMOS_FILTER_TYPE_PROBE_HITS_WSUM are handled by the underlying &struct - * damon_operations as a part of scheme action trying, and therefore accounted - * as 'tried'. In contrast, &DAMOS_FILTER_TYPE_ADDR, &DAMOS_FILTER_TYPE_TARGET - * and &DAMOS_FILTER_TYPE_PROBE_HITS_WSUM filters are handled by the core layer - * before trying of the action, and therefore not accounted as 'tried'. + * All types except &DAMOS_FILTER_TYPE_ADDR, &DAMOS_FILTER_TYPE_TARGET, + * &DAMOS_FILTER_TYPE_PROBE_HITS_WSUM and &DAMOS_FILTER_TYPE_AGE_MS are handled + * by the underlying &struct damon_operations as a part of scheme action + * trying, and therefore accounted as 'tried'. In contrast, + * &DAMOS_FILTER_TYPE_ADDR, &DAMOS_FILTER_TYPE_TARGET, + * &DAMOS_FILTER_TYPE_PROBE_HITS_WSUM and &DAMOS_FILTER_TYPE_AGE_MS filters are + * handled by the core layer before trying of the action, and therefore not + * accounted as 'tried'. * * Support for the operations-handled filters depends on the running * &struct damon_operations. @@ -415,6 +418,7 @@ enum damos_filter_type { DAMOS_FILTER_TYPE_ADDR, DAMOS_FILTER_TYPE_TARGET, DAMOS_FILTER_TYPE_PROBE_HITS_WSUM, + DAMOS_FILTER_TYPE_AGE_MS, }; /** diff --git a/mm/damon/core.c b/mm/damon/core.c index d36823f4d0928..0a056949604f9 100644 --- a/mm/damon/core.c +++ b/mm/damon/core.c @@ -659,6 +659,7 @@ bool damos_filter_for_ops(enum damos_filter_type type) case DAMOS_FILTER_TYPE_ADDR: case DAMOS_FILTER_TYPE_TARGET: case DAMOS_FILTER_TYPE_PROBE_HITS_WSUM: + case DAMOS_FILTER_TYPE_AGE_MS: return false; default: break; @@ -1336,6 +1337,7 @@ static int damos_commit_filter_arg( dst->sz_range = src->sz_range; break; case DAMOS_FILTER_TYPE_PROBE_HITS_WSUM: + case DAMOS_FILTER_TYPE_AGE_MS: if (src->range_max < src->range_min) return -EINVAL; dst->range_min = src->range_min; @@ -2552,7 +2554,7 @@ static bool damos_filter_match(struct damon_ctx *ctx, struct damon_target *t, bool matched = false; struct damon_target *ti; int target_idx = 0; - unsigned long start, end, wsum; + unsigned long start, end, wsum, age_ms; *err = 0; switch (filter->type) { @@ -2594,6 +2596,12 @@ static bool damos_filter_match(struct damon_ctx *ctx, struct damon_target *t, matched = filter->range_min <= wsum && wsum <= filter->range_max; break; + case DAMOS_FILTER_TYPE_AGE_MS: + age_ms = div_u64((u64)r->age * ctx->attrs.aggr_interval, + USEC_PER_MSEC); + matched = filter->range_min <= age_ms && + age_ms <= filter->range_max; + break; default: return false; } -- 2.47.3