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[98.38.17.99]) by smtp.googlemail.com with ESMTPSA id 006d021491bc7-680a63c7fd1sm12254208eaf.8.2026.04.08.13.02.42 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Wed, 08 Apr 2026 13:02:43 -0700 (PDT) From: Jim Cromie To: linux-kernel@vger.kernel.org Cc: gregkh@linuxfoundation.org, jbaron@akamai.com, louis.chauvet@bootlin.com, Jim Cromie Subject: [PATCH v13 28/36] dyndbg-test: change do_prints testpoint to accept a loopct Date: Wed, 8 Apr 2026 14:02:03 -0600 Message-ID: <20260408200211.43821-29-jim.cromie@gmail.com> X-Mailer: git-send-email 2.53.0 In-Reply-To: <20260408200211.43821-1-jim.cromie@gmail.com> References: <20260408200211.43821-1-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). Reviewed-by: Louis Chauvet 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 2107d4821019..5de839f13c8b 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, @@ -195,17 +202,20 @@ 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; } -- 2.53.0