+ mm-oom_killer-simplify-oom-killer-info-dump-helper.patch added to mm-unstable branch

+ mm-oom_killer-simplify-oom-killer-info-dump-helper.patch added to mm-unstable branch

[Andrew Morton]

The patch titled
     Subject: mm/oom_killer: simplify OOM killer info dump helper
has been added to the -mm mm-unstable branch.  Its filename is
     mm-oom_killer-simplify-oom-killer-info-dump-helper.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/mm-oom_killer-simplify-oom-killer-info-dump-helper.patch

This patch will later appear in the mm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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------------------------------------------------------
From: Kairui Song <kasong@tencent.com>
Subject: mm/oom_killer: simplify OOM killer info dump helper
Date: Mon, 16 Oct 2023 19:31:03 +0800

There is only one caller wants to dump the kill victim info, so just let
it call the standalone helper, no need to make the generic info dump
helper take an extra argument for that.

Result of bloat-o-meter:
./scripts/bloat-o-meter ./mm/oom_kill.old.o ./mm/oom_kill.o
add/remove: 0/0 grow/shrink: 1/2 up/down: 131/-142 (-11)
Function                                     old     new   delta
oom_kill_process                             412     543    +131
out_of_memory                               1422    1418      -4
dump_header                                  562     424    -138
Total: Before=21514, After=21503, chg -0.05%

Link: https://lkml.kernel.org/r/20231016113103.86477-1-ryncsn@gmail.com
Signed-off-by: Kairui Song <kasong@tencent.com>
Cc: Christian Brauner <brauner@kernel.org>
Cc: Michal Hocko <mhocko@suse.com>
Cc: Suren Baghdasaryan <surenb@google.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 mm/oom_kill.c |   16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

--- a/mm/oom_kill.c~mm-oom_killer-simplify-oom-killer-info-dump-helper
+++ a/mm/oom_kill.c
@@ -437,7 +437,7 @@ static void dump_tasks(struct oom_contro
 	}
 }
 
-static void dump_oom_summary(struct oom_control *oc, struct task_struct *victim)
+static void dump_oom_victim(struct oom_control *oc, struct task_struct *victim)
 {
 	/* one line summary of the oom killer context. */
 	pr_info("oom-kill:constraint=%s,nodemask=%*pbl",
@@ -449,7 +449,7 @@ static void dump_oom_summary(struct oom_
 		from_kuid(&init_user_ns, task_uid(victim)));
 }
 
-static void dump_header(struct oom_control *oc, struct task_struct *p)
+static void dump_header(struct oom_control *oc)
 {
 	pr_warn("%s invoked oom-killer: gfp_mask=%#x(%pGg), order=%d, oom_score_adj=%hd\n",
 		current->comm, oc->gfp_mask, &oc->gfp_mask, oc->order,
@@ -467,8 +467,6 @@ static void dump_header(struct oom_contr
 	}
 	if (sysctl_oom_dump_tasks)
 		dump_tasks(oc);
-	if (p)
-		dump_oom_summary(oc, p);
 }
 
 /*
@@ -1029,8 +1027,10 @@ static void oom_kill_process(struct oom_
 	}
 	task_unlock(victim);
 
-	if (__ratelimit(&oom_rs))
-		dump_header(oc, victim);
+	if (__ratelimit(&oom_rs)) {
+		dump_header(oc);
+		dump_oom_victim(oc, victim);
+	}
 
 	/*
 	 * Do we need to kill the entire memory cgroup?
@@ -1072,7 +1072,7 @@ static void check_panic_on_oom(struct oo
 	/* Do not panic for oom kills triggered by sysrq */
 	if (is_sysrq_oom(oc))
 		return;
-	dump_header(oc, NULL);
+	dump_header(oc);
 	panic("Out of memory: %s panic_on_oom is enabled\n",
 		sysctl_panic_on_oom == 2 ? "compulsory" : "system-wide");
 }
@@ -1155,7 +1155,7 @@ bool out_of_memory(struct oom_control *o
 	select_bad_process(oc);
 	/* Found nothing?!?! */
 	if (!oc->chosen) {
-		dump_header(oc, NULL);
+		dump_header(oc);
 		pr_warn("Out of memory and no killable processes...\n");
 		/*
 		 * If we got here due to an actual allocation at the
_

Patches currently in -mm which might be from kasong@tencent.com are

mm-oom_killer-simplify-oom-killer-info-dump-helper.patch