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2024-02-20 ea08eeccae9297f7aabd2ef7f0c2517ac4549acc

 kernel/mm/vmpressure.c
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@@ -1,3 +1,4 @@
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+// SPDX-License-Identifier: GPL-2.0-only
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 /*
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  * Linux VM pressure
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  *
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@@ -6,10 +7,6 @@
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  *
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  * Based on ideas from Andrew Morton, David Rientjes, KOSAKI Motohiro,
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  * Leonid Moiseichuk, Mel Gorman, Minchan Kim and Pekka Enberg.
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- *
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- * This program is free software; you can redistribute it and/or modify it
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- * under the terms of the GNU General Public License version 2 as published
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- * by the Free Software Foundation.
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  */
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 #include <linux/cgroup.h>
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@@ -23,6 +20,8 @@
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 #include <linux/swap.h>
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 #include <linux/printk.h>
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 #include <linux/vmpressure.h>
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+
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+#include <trace/hooks/mm.h>
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 /*
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  * The window size (vmpressure_win) is the number of scanned pages before
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@@ -243,7 +242,17 @@
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 void vmpressure(gfp_t gfp, struct mem_cgroup *memcg, bool tree,
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 		unsigned long scanned, unsigned long reclaimed)
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 {
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-	struct vmpressure *vmpr = memcg_to_vmpressure(memcg);
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+	struct vmpressure *vmpr;
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+	bool bypass = false;
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+
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+	if (mem_cgroup_disabled())
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+		return;
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+
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+	vmpr = memcg_to_vmpressure(memcg);
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+
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+	trace_android_vh_vmpressure(memcg, &bypass);
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+	if (unlikely(bypass))
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+		return;
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 	/*
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 	 * Here we only want to account pressure that userland is able to
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@@ -283,7 +292,7 @@
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 		enum vmpressure_levels level;
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 		/* For now, no users for root-level efficiency */
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-		if (!memcg || memcg == root_mem_cgroup)
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+		if (!memcg || mem_cgroup_is_root(memcg))
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 			return;
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 		spin_lock(&vmpr->sr_lock);
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@@ -374,10 +383,8 @@
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 	int ret = 0;
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 	spec_orig = spec = kstrndup(args, MAX_VMPRESSURE_ARGS_LEN, GFP_KERNEL);
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-	if (!spec) {
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-		ret = -ENOMEM;
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-		goto out;
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-	}
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+	if (!spec)
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+		return -ENOMEM;
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 	/* Find required level */
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 	token = strsep(&spec, ",");