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Sat, 21 Jun 2025 19:20:17 +0000 (GMT) From: Madadi Vineeth Reddy To: util-linux@vger.kernel.org, Karel Zak , Benno Schulenberg Cc: Madadi Vineeth Reddy Subject: [PATCH v3 2/3] chrt: Only display current settings when no policy is specified Date: Sun, 22 Jun 2025 00:49:55 +0530 Message-ID: <20250621191956.21142-3-vineethr@linux.ibm.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250621191956.21142-1-vineethr@linux.ibm.com> References: <20250621191956.21142-1-vineethr@linux.ibm.com> Precedence: bulk X-Mailing-List: util-linux@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Spam-Details-Enc: AW1haW4tMjUwNjIxMDEyMiBTYWx0ZWRfX9/XyM5baLeFw GZiWix9YjUFxcOZnw4hMp4ZGJkXU2kXSv7RE96rRGNk6QU4M+nBSNabIuuPOZaRT3l+H0Sm7kXk XTfzhGG9GpjeYXbJ4EEpr5duq0sMok5TTlvMp+U67PxXcORTl/Y21utonpxSVFFCYgj08Knv5ot sJGiQAl+iEPGDdiflWdsWhHdM40PMt4/yhKDsNPpgaguTwoZjqIV4UGODuBUcC5mmDjHale+enZ AQm9IdvaAWqMLpg/OXBorHb4AAgRJwhRPdWB5fSO4kavihhYKs94Pv4UArHcTakNL+W7NAb0Vkq oVC05uCTCKLD7FyMUKIvAXCKfV7tAiSe4NvvLv2TFkN3pwcPRRA78Sw+pK3GoHiDnjb0qaGQIaR MPocBTpWPmUY7WN0rt9paMWKG1ezxLoxFwE0OUCfypfvaL3QQ7Uk8Fyn/yeB9DXmEneJvhBj X-Proofpoint-GUID: CtAWIVefxOKOIh4I6dARMaSDmm2e2FYX X-Proofpoint-ORIG-GUID: CtAWIVefxOKOIh4I6dARMaSDmm2e2FYX X-Authority-Analysis: v=2.4 cv=combk04i c=1 sm=1 tr=0 ts=685705f9 cx=c_pps a=3Bg1Hr4SwmMryq2xdFQyZA==:117 a=3Bg1Hr4SwmMryq2xdFQyZA==:17 a=IkcTkHD0fZMA:10 a=6IFa9wvqVegA:10 a=VnNF1IyMAAAA:8 a=EeF4qO850oZfgqQkHikA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1099,Hydra:6.0.736,FMLib:17.12.80.40 definitions=2025-06-21_06,2025-06-20_01,2025-03-28_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 malwarescore=0 spamscore=0 adultscore=0 mlxlogscore=999 clxscore=1015 impostorscore=0 suspectscore=0 mlxscore=0 phishscore=0 lowpriorityscore=0 bulkscore=0 classifier=spam authscore=0 authtc=n/a authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.19.0-2505280000 definitions=main-2506210122 Previously, running "chrt --pid " with no policy options would display the process’s current scheduling attributes, but specifying a policy without a priority (e.g. chrt --rr --pid ) would silently fallback to displaying the same info. This was confusing, since a policy option normally implies an intent to change something. This patch changes the behavior so that chrt --pid continues to show the current settings: chrt --pid 10862 pid 10862's current scheduling policy: SCHED_OTHER pid 10862's current scheduling priority: 0 pid 10862's current runtime parameter: 2800000 If a policy is specified but no priority follows, chrt now errors out: chrt --rr --pid 10862 chrt: policy SCHED_RR requires a priority argument Verbose output (-v) still prints the current settings when a valid policy+priority is provided. Signed-off-by: Madadi Vineeth Reddy --- schedutils/chrt.c | 25 +++++++++++++++++++++---- 1 file changed, 21 insertions(+), 4 deletions(-) diff --git a/schedutils/chrt.c b/schedutils/chrt.c index 8fe748f43..40a006040 100644 --- a/schedutils/chrt.c +++ b/schedutils/chrt.c @@ -64,7 +64,7 @@ static void __attribute__((__noreturn__)) usage(void) " chrt [options] --pid \n"), out); fputs(USAGE_SEPARATOR, out); fputs(_("Get policy:\n" - " chrt [options] --pid \n"), out); + " chrt --pid \n"), out); fputs(USAGE_SEPARATOR, out); fputs(_("Policy options:\n"), out); @@ -399,6 +399,7 @@ int main(int argc, char **argv) { struct chrt_ctl _ctl = { .pid = -1, .policy = SCHED_RR }, *ctl = &_ctl; int c; + bool policy_given = false; static const struct option longopts[] = { { "all-tasks", no_argument, NULL, 'a' }, @@ -435,21 +436,25 @@ int main(int argc, char **argv) case 'b': #ifdef SCHED_BATCH ctl->policy = SCHED_BATCH; + policy_given = true; #endif break; case 'd': #ifdef SCHED_DEADLINE ctl->policy = SCHED_DEADLINE; + policy_given = true; #endif break; case 'e': #ifdef SCHED_EXT ctl->policy = SCHED_EXT; + policy_given = true; #endif break; case 'f': ctl->policy = SCHED_FIFO; + policy_given = true; break; case 'R': ctl->reset_on_fork = 1; @@ -457,6 +462,7 @@ int main(int argc, char **argv) case 'i': #ifdef SCHED_IDLE ctl->policy = SCHED_IDLE; + policy_given = true; #endif break; case 'm': @@ -464,6 +470,7 @@ int main(int argc, char **argv) return EXIT_SUCCESS; case 'o': ctl->policy = SCHED_OTHER; + policy_given = true; break; case 'p': errno = 0; @@ -472,6 +479,7 @@ int main(int argc, char **argv) break; case 'r': ctl->policy = SCHED_RR; + policy_given = true; break; case 'v': ctl->verbose = 1; @@ -501,12 +509,21 @@ int main(int argc, char **argv) errtryhelp(EXIT_FAILURE); } - if ((ctl->pid > -1) && (ctl->verbose || argc - optind == 1)) { + /*pid exists but priority not given*/ + if (ctl->pid > -1 && argc - optind == 1) { + /* Error if a policy was specified but no priority given */ + if (policy_given) + errx(EXIT_FAILURE, ("policy %s requires a priority argument"), + get_policy_name(ctl->policy)); + + /* If no policy specified, show current settings */ show_sched_info(ctl); - if (argc - optind == 1) - return EXIT_SUCCESS; + return EXIT_SUCCESS; } + if (ctl->verbose) + show_sched_info(ctl); + errno = 0; ctl->priority = strtos32_or_err(argv[optind], _("invalid priority argument")); -- 2.49.0