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Mon, 22 Dec 2025 00:25:41 -0800 (PST) Received: from frodo ([2404:4400:417e:3d00:8b90:7f55:1261:772f]) by smtp.googlemail.com with ESMTPSA id d2e1a72fcca58-7ff7e493123sm9540699b3a.50.2025.12.22.00.25.29 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 22 Dec 2025 00:25:40 -0800 (PST) From: Jim Cromie To: linux-kernel@vger.kernel.org, jbaron@akamai.com, gregkh@linuxfoundation.org, ukaszb@chromium.org, louis.chauvet@bootlin.com Cc: dri-devel@lists.freedesktop.org, amd-gfx@lists.freedesktop.org, intel-gvt-dev@lists.freedesktop.org, intel-gfx@lists.freedesktop.org, daniel.vetter@ffwll.ch, tvrtko.ursulin@linux.intel.com, jani.nikula@intel.com, ville.syrjala@linux.intel.com, seanpaul@chromium.org, robdclark@gmail.com, groeck@google.com, yanivt@google.com, bleung@google.com, quic_saipraka@quicinc.com, will@kernel.org, catalin.marinas@arm.com, quic_psodagud@quicinc.com, maz@kernel.org, arnd@arndb.de, linux-arm-kernel@lists.infradead.org, linux-arm-msm@vger.kernel.org, mingo@redhat.com, jim.cromie@gmail.com Subject: [PATCH v7 24/31] dyndbg-test: change do_prints testpoint to accept a loopct Date: Mon, 22 Dec 2025 21:20:41 +1300 Message-ID: <20251222082049.1782440-25-jim.cromie@gmail.com> X-Mailer: git-send-email 2.52.0 In-Reply-To: <20251222082049.1782440-3-jim.cromie@gmail.com> References: <20251222082049.1782440-3-jim.cromie@gmail.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit echo 1000 > /sys/module/test_dynamic_debug/parameters/do_prints This allows its use as a scriptable load generator, to generate dynamic-prefix-emits for flag combinations vs undecorated messages. This will make it easy to assess the cost of the prefixing. Reading the ./do_prints node also prints messages (once) to the-log. Signed-off-by: Jim Cromie --- lib/test_dynamic_debug.c | 32 +++++++++++++++++++++----------- 1 file changed, 21 insertions(+), 11 deletions(-) diff --git a/lib/test_dynamic_debug.c b/lib/test_dynamic_debug.c index b2bdfdfb6ba1..fa81177e8089 100644 --- a/lib/test_dynamic_debug.c +++ b/lib/test_dynamic_debug.c @@ -29,18 +29,25 @@ #include -/* re-gen output by reading or writing sysfs node: do_prints */ - -static void do_prints(void); /* device under test */ +/* re-trigger debug output by reading or writing sysfs node: do_prints */ +static void do_prints(unsigned int); /* device under test */ static int param_set_do_prints(const char *instr, const struct kernel_param *kp) { - do_prints(); + int rc; + unsigned int ct; + + rc = kstrtouint(instr, 0, &ct); + if (rc) { + pr_err("expecting numeric input, using 1 instead\n"); + ct = 1; + } + do_prints(ct); return 0; } static int param_get_do_prints(char *buffer, const struct kernel_param *kp) { - do_prints(); - return scnprintf(buffer, PAGE_SIZE, "did do_prints\n"); + do_prints(1); + return scnprintf(buffer, PAGE_SIZE, "did 1 do_prints\n"); } static const struct kernel_param_ops param_ops_do_prints = { .set = param_set_do_prints, @@ -191,17 +198,20 @@ static void do_levels(void) prdbg(V7); } -static void do_prints(void) +static void do_prints(unsigned int ct) { - pr_debug("do_prints:\n"); - do_cats(); - do_levels(); + /* maybe clamp this */ + pr_debug("do-prints %d times:\n", ct); + for (; ct; ct--) { + do_cats(); + do_levels(); + } } static int __init test_dynamic_debug_init(void) { pr_debug("init start\n"); - do_prints(); + do_prints(1); pr_debug("init done\n"); return 0; } -- 2.52.0