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[82.0.238.185]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-464f64ad1b0sm278986535e9.21.2025.09.23.07.23.44 for (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 23 Sep 2025 07:23:44 -0700 (PDT) From: acampanella-thegoodpenguin Date: Tue, 23 Sep 2025 15:23:39 +0100 Subject: [PATCH PREVIEW RFC 2/6] raid6: Add bootcache Precedence: bulk X-Mailing-List: linux-embedded@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Message-Id: <20250923-bootcache-v1-2-4f86fdc38b4e@thegoodpenguin.co.uk> References: <20250923-bootcache-v1-0-4f86fdc38b4e@thegoodpenguin.co.uk> In-Reply-To: <20250923-bootcache-v1-0-4f86fdc38b4e@thegoodpenguin.co.uk> To: linux-embedded@vger.kernel.org X-Mailer: b4 0.14.2 X-Developer-Signature: v=1; a=ed25519-sha256; t=1758637422; l=1758; i=acampanella@thegoodpenguin.co.uk; s=20250829; h=from:subject:message-id; bh=qtpxFzF9TEagavgF+PepjCUoOkOD92N7fcs3YB4bbGw=; b=9f2mZPlUDn0TcSAfrpUYnKmGKWXKJySv5+DOChlKsAyb5Ssq8POFs+hfBn3ssil11aR0asKqS KWhPtnkU+PmD4Oa4N+4k+eABuzEZgyIP36QCbALmtKuQp5U4dDtlXoa X-Developer-Key: i=acampanella@thegoodpenguin.co.uk; a=ed25519; pk=qruBFipuvuZJTNm9XzFhMz42Q9F+xwyW1On3NgZHwzg= Check for previously cached results before benchmark Signed-off-by: Andrea Campanella --- lib/raid6/algos.c | 21 +++++++++++++++++++++ 1 file changed, 21 insertions(+) diff --git a/lib/raid6/algos.c b/lib/raid6/algos.c index 799e0e5eac26db3d10c07e79f46537af4ec6f182..fc69d94afdb4fc153626a3e21c506eda57540618 100644 --- a/lib/raid6/algos.c +++ b/lib/raid6/algos.c @@ -19,6 +19,7 @@ #include #include #endif +#include struct raid6_calls raid6_call; EXPORT_SYMBOL_GPL(raid6_call); @@ -159,6 +160,24 @@ static inline const struct raid6_calls *raid6_choose_gen( int start = (disks>>1)-1, stop = disks-3; /* work on the second half of the disks */ const struct raid6_calls *const *algo; const struct raid6_calls *best; + char cached_algo_name[32]; + + /* Try to get cached algorithm by name */ + if (bootcache_get_string("raid6_best_algo", cached_algo_name, + sizeof(cached_algo_name)) == 0) { + /* Find algorithm by name */ + for (algo = raid6_algos; *algo; algo++) { + if (strcmp((*algo)->name, cached_algo_name) == 0) { + if (!(*algo)->valid || (*algo)->valid()) { + raid6_call = *algo; + pr_info("raid6: using algorithm %s (from cache)\n", + (*algo)->name); + return best; + } + break; + } + } + } for (bestgenperf = 0, best = NULL, algo = raid6_algos; *algo; algo++) { if (!best || (*algo)->priority >= best->priority) { @@ -198,6 +217,8 @@ static inline const struct raid6_calls *raid6_choose_gen( goto out; } + bootcache_set_string("raid6_best_algo", best->name); + raid6_call = *best; if (!IS_ENABLED(CONFIG_RAID6_PQ_BENCHMARK)) { -- 2.48.1