150 lines
5.3 KiB
Diff
150 lines
5.3 KiB
Diff
From 47d375ac822d413999c92520402c4868ce2275cc Mon Sep 17 00:00:00 2001
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From: Kazuhito Hagio <k-hagio-ab@nec.com>
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Date: Fri, 16 Dec 2022 14:03:46 +0900
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Subject: [PATCH 60/89] SLUB: Fix for offset change of struct slab members on
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Linux 6.2-rc1
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The following kernel commits split slab info from struct page into
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struct slab in Linux 5.17.
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d122019bf061 ("mm: Split slab into its own type")
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07f910f9b729 ("mm: Remove slab from struct page")
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Crash commit 5f390ed811b0 followed the change for SLUB, but crash still
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uses the offset of page.lru inappropriately. Luckily, it could work
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because it was the same value as the offset of slab.slab_list until
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Linux 6.1.
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However, kernel commit 130d4df57390 ("mm/sl[au]b: rearrange struct slab
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fields to allow larger rcu_head") in Linux 6.2-rc1 changed the offset of
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slab.slab_list. As a result, without the patch, "kmem -s|-S" options
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print the following errors and fail to print values correctly for
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kernels configured with CONFIG_SLUB.
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crash> kmem -S filp
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CACHE OBJSIZE ALLOCATED TOTAL SLABS SSIZE NAME
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kmem: filp: partial list slab: ffffcc650405ab88 invalid page.inuse: -1
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ffff8fa0401eca00 232 1267 1792 56 8k filp
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...
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KMEM_CACHE_NODE NODE SLABS PARTIAL PER-CPU
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ffff8fa0401cb8c0 0 56 24 8
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NODE 0 PARTIAL:
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SLAB MEMORY NODE TOTAL ALLOCATED FREE
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kmem: filp: invalid partial list slab pointer: ffffcc650405ab88
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Signed-off-by: Kazuhito Hagio <k-hagio-ab@nec.com>
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Signed-off-by: Lianbo Jiang <lijiang@redhat.com>
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---
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defs.h | 1 +
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memory.c | 16 ++++++++++------
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symbols.c | 1 +
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3 files changed, 12 insertions(+), 6 deletions(-)
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diff --git a/defs.h b/defs.h
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index 9c91f38328d0..31702e707bee 100644
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--- a/defs.h
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+++ b/defs.h
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@@ -2188,6 +2188,7 @@ struct offset_table { /* stash of commonly-used offsets */
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long blk_mq_tags_rqs;
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long request_queue_hctx_table;
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long percpu_counter_counters;
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+ long slab_slab_list;
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};
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struct size_table { /* stash of commonly-used sizes */
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diff --git a/memory.c b/memory.c
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index 9d003713534b..d05737cc1429 100644
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--- a/memory.c
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+++ b/memory.c
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@@ -781,6 +781,8 @@ vm_init(void)
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if (INVALID_MEMBER(page_slab))
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MEMBER_OFFSET_INIT(page_slab, "slab", "slab_cache");
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+ MEMBER_OFFSET_INIT(slab_slab_list, "slab", "slab_list");
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+
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MEMBER_OFFSET_INIT(page_slab_page, "page", "slab_page");
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if (INVALID_MEMBER(page_slab_page))
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ANON_MEMBER_OFFSET_INIT(page_slab_page, "page", "slab_page");
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@@ -19474,6 +19476,7 @@ do_node_lists_slub(struct meminfo *si, ulong node_ptr, int node)
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{
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ulong next, last, list_head, flags;
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int first;
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+ long list_off = VALID_MEMBER(slab_slab_list) ? OFFSET(slab_slab_list) : OFFSET(page_lru);
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if (!node_ptr)
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return;
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@@ -19487,7 +19490,7 @@ do_node_lists_slub(struct meminfo *si, ulong node_ptr, int node)
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next == list_head ? " (empty)\n" : "");
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first = 0;
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while (next != list_head) {
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- si->slab = last = next - OFFSET(page_lru);
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+ si->slab = last = next - list_off;
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if (first++ == 0)
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fprintf(fp, " %s", slab_hdr);
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@@ -19510,7 +19513,7 @@ do_node_lists_slub(struct meminfo *si, ulong node_ptr, int node)
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if (!IS_KVADDR(next) ||
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((next != list_head) &&
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- !is_page_ptr(next - OFFSET(page_lru), NULL))) {
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+ !is_page_ptr(next - list_off, NULL))) {
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error(INFO,
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"%s: partial list slab: %lx invalid page.lru.next: %lx\n",
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si->curname, last, next);
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@@ -19537,7 +19540,7 @@ do_node_lists_slub(struct meminfo *si, ulong node_ptr, int node)
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next == list_head ? " (empty)\n" : "");
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first = 0;
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while (next != list_head) {
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- si->slab = next - OFFSET(page_lru);
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+ si->slab = next - list_off;
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if (first++ == 0)
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fprintf(fp, " %s", slab_hdr);
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@@ -19754,6 +19757,7 @@ count_partial(ulong node, struct meminfo *si, ulong *free)
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short inuse, objects;
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ulong total_inuse;
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ulong count = 0;
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+ long list_off = VALID_MEMBER(slab_slab_list) ? OFFSET(slab_slab_list) : OFFSET(page_lru);
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count = 0;
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total_inuse = 0;
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@@ -19765,12 +19769,12 @@ count_partial(ulong node, struct meminfo *si, ulong *free)
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hq_open();
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while (next != list_head) {
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- if (!readmem(next - OFFSET(page_lru) + OFFSET(page_inuse),
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+ if (!readmem(next - list_off + OFFSET(page_inuse),
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KVADDR, &inuse, sizeof(ushort), "page.inuse", RETURN_ON_ERROR)) {
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hq_close();
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return -1;
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}
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- last = next - OFFSET(page_lru);
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+ last = next - list_off;
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if (inuse == -1) {
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error(INFO,
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@@ -19796,7 +19800,7 @@ count_partial(ulong node, struct meminfo *si, ulong *free)
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}
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if (!IS_KVADDR(next) ||
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((next != list_head) &&
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- !is_page_ptr(next - OFFSET(page_lru), NULL))) {
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+ !is_page_ptr(next - list_off, NULL))) {
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error(INFO, "%s: partial list slab: %lx invalid page.lru.next: %lx\n",
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si->curname, last, next);
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break;
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diff --git a/symbols.c b/symbols.c
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index d1b35a56aa71..9e6fca73eaf9 100644
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--- a/symbols.c
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+++ b/symbols.c
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@@ -9722,6 +9722,7 @@ dump_offset_table(char *spec, ulong makestruct)
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OFFSET(slab_inuse));
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fprintf(fp, " slab_free: %ld\n",
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OFFSET(slab_free));
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+ fprintf(fp, " slab_slab_list: %ld\n", OFFSET(slab_slab_list));
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fprintf(fp, " kmem_cache_size: %ld\n",
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OFFSET(kmem_cache_size));
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--
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2.37.1
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