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The patches were generated from the RPi repo with the following command: git format-patch v6.6.34..rpi-6.1.y Some patches needed rebasing and, as usual, the applied and reverted, wireless drivers, Github workflows, READMEs and defconfigs patches were removed. Signed-off-by: Álvaro Fernández Rojas <noltari@gmail.com>
68 lines
2.5 KiB
Diff
68 lines
2.5 KiB
Diff
From 7b14f3444cf6b54b9905f2e7e1507e68fd92a9c0 Mon Sep 17 00:00:00 2001
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From: David Plowman <david.plowman@raspberrypi.com>
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Date: Tue, 29 Mar 2022 16:10:06 +0100
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Subject: [PATCH 0359/1085] mm,page_alloc,cma: introduce a customisable
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threshold for allocating pages in cma
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On some platforms the cma area can be half the entire system memory,
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meaning that allocations start happening in the cma area immediately.
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This leads to fragmentation and subsequent fatal cma_alloc failures.
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We introduce an "alloc_in_cma_threshold" parameter which requires that
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this many sixteenths of the free pages must be in cma before it will
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try to use them. By default this is set to 12, but the previous
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behaviour can be restored by setting it to 8 on startup.
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Signed-off-by: David Plowman <david.plowman@raspberrypi.com>
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---
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mm/page_alloc.c | 28 +++++++++++++++++++++++++---
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1 file changed, 25 insertions(+), 3 deletions(-)
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--- a/mm/page_alloc.c
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+++ b/mm/page_alloc.c
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@@ -204,6 +204,27 @@ EXPORT_SYMBOL(node_states);
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gfp_t gfp_allowed_mask __read_mostly = GFP_BOOT_MASK;
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+#define ALLOC_IN_CMA_THRESHOLD_MAX 16
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+#define ALLOC_IN_CMA_THRESHOLD_DEFAULT 12
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+
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+static unsigned long _alloc_in_cma_threshold __read_mostly
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+ = ALLOC_IN_CMA_THRESHOLD_DEFAULT;
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+
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+static int __init alloc_in_cma_threshold_setup(char *buf)
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+{
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+ unsigned long res;
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+
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+ if (kstrtoul(buf, 10, &res) < 0 ||
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+ res > ALLOC_IN_CMA_THRESHOLD_MAX) {
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+ pr_err("Bad alloc_cma_threshold value\n");
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+ return 0;
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+ }
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+ _alloc_in_cma_threshold = res;
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+ pr_info("Setting alloc_in_cma_threshold to %lu\n", res);
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+ return 0;
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+}
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+early_param("alloc_in_cma_threshold", alloc_in_cma_threshold_setup);
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+
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/*
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* A cached value of the page's pageblock's migratetype, used when the page is
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* put on a pcplist. Used to avoid the pageblock migratetype lookup when
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@@ -2090,12 +2111,13 @@ __rmqueue(struct zone *zone, unsigned in
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if (IS_ENABLED(CONFIG_CMA)) {
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/*
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* Balance movable allocations between regular and CMA areas by
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- * allocating from CMA when over half of the zone's free memory
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- * is in the CMA area.
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+ * allocating from CMA when over more than a given proportion of
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+ * the zone's free memory is in the CMA area.
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*/
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if (alloc_flags & ALLOC_CMA &&
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zone_page_state(zone, NR_FREE_CMA_PAGES) >
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- zone_page_state(zone, NR_FREE_PAGES) / 2) {
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+ zone_page_state(zone, NR_FREE_PAGES) / ALLOC_IN_CMA_THRESHOLD_MAX
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+ * _alloc_in_cma_threshold) {
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page = __rmqueue_cma_fallback(zone, order);
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if (page)
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return page;
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