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From c15da07526291a5c357010cb4aaf4bde6151e642 Mon Sep 17 00:00:00 2001
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From: Johan Erlandsson <johan.erlandsson@sony.com>
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Date: Wed, 19 Apr 2023 11:26:04 +0200
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Subject: [PATCH 06/14] use NR_SWAPCACHE when nr_swapper_spaces isn't available
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In 5.12 the following change was introduced:
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b6038942480e ("mm: memcg: add swapcache stat for memcg v2")
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Then the variable 'nr_swapper_spaces' is not read (unless
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CONFIG_DEBUG_VM=y). In GKI builds this variable is then optimized
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out. But the same change provided a new way to obtain the same
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information, using NR_SWAPCACHE.
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Reported-by: xueguolun <xueguolun@xiaomi.com>
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Signed-off-by: Johan Erlandsson <johan.erlandsson@sony.com>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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memory.c | 6 ++++--
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1 file changed, 4 insertions(+), 2 deletions(-)
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diff --git a/memory.c b/memory.c
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index 791194a405d4..b84e974a3325 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -8486,7 +8486,7 @@ dump_kmeminfo(void)
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ulong hugetlb_total_pages, hugetlb_total_free_pages = 0;
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int done_hugetlb_calc = 0;
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long nr_file_pages, nr_slab;
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- ulong swapper_space_nrpages;
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+ long swapper_space_nrpages;
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ulong pct;
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uint tmp;
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struct meminfo meminfo;
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@@ -8609,7 +8609,9 @@ dump_kmeminfo(void)
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char *swapper_space = GETBUF(SIZE(address_space));
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swapper_space_nrpages = 0;
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- if (symbol_exists("nr_swapper_spaces") &&
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+ if (dump_vm_stat("NR_SWAPCACHE", &swapper_space_nrpages, 0)) {
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+ ;
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+ } else if (symbol_exists("nr_swapper_spaces") &&
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(len = get_array_length("nr_swapper_spaces",
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NULL, 0))) {
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char *nr_swapper_space =
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--
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2.41.0
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