change system file

hc

2024-10-09 244b2c5ca8b14627e4a17755e5922221e121c771

 kernel/kernel/cgroup/freezer.c
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@@ -6,6 +6,8 @@
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 #include "cgroup-internal.h"
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+#include <trace/events/cgroup.h>
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+
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 /*
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  * Propagate the cgroup frozen state upwards by the cgroup tree.
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  */
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@@ -28,6 +30,7 @@
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 			    cgrp->nr_descendants) {
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 				set_bit(CGRP_FROZEN, &cgrp->flags);
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 				cgroup_file_notify(&cgrp->events_file);
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+				TRACE_CGROUP_PATH(notify_frozen, cgrp, 1);
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 				desc++;
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 			}
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 		} else {
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@@ -35,6 +38,7 @@
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 			if (test_bit(CGRP_FROZEN, &cgrp->flags)) {
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 				clear_bit(CGRP_FROZEN, &cgrp->flags);
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 				cgroup_file_notify(&cgrp->events_file);
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+				TRACE_CGROUP_PATH(notify_frozen, cgrp, 0);
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 				desc++;
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 			}
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 		}
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@@ -73,6 +77,7 @@
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 		clear_bit(CGRP_FROZEN, &cgrp->flags);
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 	}
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 	cgroup_file_notify(&cgrp->events_file);
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+	TRACE_CGROUP_PATH(notify_frozen, cgrp, frozen);
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 	/* Update the state of ancestor cgroups. */
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 	cgroup_propagate_frozen(cgrp, frozen);
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@@ -134,19 +139,13 @@
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 		cgroup_update_frozen(cgrp);
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 		WARN_ON_ONCE(!current->frozen);
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 		current->frozen = false;
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+	} else if (!(current->jobctl & JOBCTL_TRAP_FREEZE)) {
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+		spin_lock(&current->sighand->siglock);
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+		current->jobctl |= JOBCTL_TRAP_FREEZE;
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+		set_thread_flag(TIF_SIGPENDING);
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+		spin_unlock(&current->sighand->siglock);
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 	}
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 	spin_unlock_irq(&css_set_lock);
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-
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-	if (unlikely(current->frozen)) {
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-		/*
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-		 * If the task remained in the frozen state,
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-		 * make sure it won't reach userspace without
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-		 * entering the signal handling loop.
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-		 */
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-		spin_lock_irq(&current->sighand->siglock);
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-		recalc_sigpending();
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-		spin_unlock_irq(&current->sighand->siglock);
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-	}
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 }
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 /*
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@@ -189,6 +188,11 @@
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 		clear_bit(CGRP_FREEZE, &cgrp->flags);
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 	spin_unlock_irq(&css_set_lock);
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+	if (freeze)
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+		TRACE_CGROUP_PATH(freeze, cgrp);
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+	else
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+		TRACE_CGROUP_PATH(unfreeze, cgrp);
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+
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 	css_task_iter_start(&cgrp->self, 0, &it);
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 	while ((task = css_task_iter_next(&it))) {
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 		/*
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@@ -227,6 +231,15 @@
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 		return;
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 	/*
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+	 * It's not necessary to do changes if both of the src and dst cgroups
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+	 * are not freezing and task is not frozen.
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+	 */
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+	if (!test_bit(CGRP_FREEZE, &src->flags) &&
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+	    !test_bit(CGRP_FREEZE, &dst->flags) &&
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+	    !task->frozen)
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+		return;
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+
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+	/*
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 	 * Adjust counters of freezing and frozen tasks.
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 	 * Note, that if the task is frozen, but the destination cgroup is not
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 	 * frozen, we bump both counters to keep them balanced.
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@@ -242,16 +255,6 @@
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 	 * Force the task to the desired state.
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 	 */
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 	cgroup_freeze_task(task, test_bit(CGRP_FREEZE, &dst->flags));
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-}
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-
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-void cgroup_freezer_frozen_exit(struct task_struct *task)
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-{
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-	struct cgroup *cgrp = task_dfl_cgroup(task);
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-
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-	lockdep_assert_held(&css_set_lock);
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-
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-	cgroup_dec_frozen_cnt(cgrp);
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-	cgroup_update_frozen(cgrp);
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 }
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 void cgroup_freeze(struct cgroup *cgrp, bool freeze)
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@@ -312,6 +315,9 @@
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 	 * In both cases it's better to notify a user, that there is
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 	 * nothing to wait for.
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 	 */
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-	if (!applied)
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+	if (!applied) {
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+		TRACE_CGROUP_PATH(notify_frozen, cgrp,
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+				  test_bit(CGRP_FROZEN, &cgrp->flags));
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 		cgroup_file_notify(&cgrp->events_file);
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+	}
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 }