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https://github.com/coolsnowwolf/lede.git
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d81c03f05e
These patches were generated from: https://github.com/raspberrypi/linux/commits/rpi-6.12.y With the following command: git format-patch -N v6.12.27..HEAD (HEAD -> 8d3206ee456a5ecdf9ddbfd8e5e231e4f0cd716e) Exceptions: - (def)configs patches - github workflows patches - applied & reverted patches - readme patches - wireless patches Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
68 lines
2.0 KiB
Diff
68 lines
2.0 KiB
Diff
From 550a46ee2e5b75f1ab6e59dc76fc9ea91093eb34 Mon Sep 17 00:00:00 2001
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From: Dom Cobley <popcornmix@gmail.com>
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Date: Wed, 5 Feb 2025 12:08:46 +0000
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Subject: [PATCH] mm/mempolicy: Ignore runtime policy changes when set through
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cmdline
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Some apps like linpack use numa_setpolicy to disable numa,
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but that tends to have a significant performance hit for us.
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If you have a cmdline.txt setting of numa_policy (to something other
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than default), then lets ignore runtime changes and stick with
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the cmdline.txt setting.
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Not specifying numa_setpolicy in cmdline, or setting
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numa_setpolicy=default(*) will allow runtime settings to work.
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(*) easier to do when numa_setpolicy=interleave is set in DT.
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Ignore logging for the first 40 seconds as there are some
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expected switches during boot.
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Signed-off-by: Dom Cobley <popcornmix@gmail.com>
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---
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mm/mempolicy.c | 11 +++++++++++
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1 file changed, 11 insertions(+)
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--- a/mm/mempolicy.c
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+++ b/mm/mempolicy.c
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@@ -85,6 +85,7 @@
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#include <linux/highmem.h>
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#include <linux/hugetlb.h>
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#include <linux/kernel.h>
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+#include <linux/ktime.h>
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#include <linux/sched.h>
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#include <linux/sched/mm.h>
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#include <linux/sched/numa_balancing.h>
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@@ -138,6 +139,7 @@ static struct mempolicy default_policy =
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.refcnt = ATOMIC_INIT(1), /* never free it */
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.mode = MPOL_LOCAL,
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};
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+static bool mempolicy_cmdline_set;
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static struct mempolicy preferred_node_policy[MAX_NUMNODES];
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@@ -1629,6 +1631,14 @@ static long kernel_set_mempolicy(int mod
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int err;
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err = sanitize_mpol_flags(&lmode, &mode_flags);
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+
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+ if (mempolicy_cmdline_set) {
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+ // ignore messages during boot which are expected
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+ if (ktime_get_boottime_seconds() > 40)
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+ pr_info("Request to set policy to %d ignored\n", mode);
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+ return 0;
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+ }
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+
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if (err)
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return err;
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@@ -3402,6 +3412,7 @@ static int __init setup_numapolicy(char
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default_policy = pol;
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mpol_to_str(buf, sizeof(buf), &pol);
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pr_info("NUMA default policy overridden to '%s'\n", buf);
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+ mempolicy_cmdline_set = pol.mode != MPOL_DEFAULT;
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} else {
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pr_warn("Unable to parse numa_policy=\n");
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}
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