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crash/0014-add-files-n-command-for-an-inode.patch
Tao Liu cdf5c99a42 Rebase to upstream crash-9.0.2 
resolves: RHEL-235439

Signed-off-by: Tao Liu <ltao@redhat.com>
2026-08-11 15:13:16 +12:00

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From 28889183d3f55c581b0810aa8bdac31e20bbf364 Mon Sep 17 00:00:00 2001
From: Huang Shijie <huangsj@hygon.cn>
Date: Mon, 18 May 2026 19:31:40 +0800
Subject: [PATCH 14/39] add "files -n" command for an inode
In the NUMA machine, it is useful to know the memory distribution of
an inode page cache:
How many pages in the node 0?
How many pages in the node 1?
Add "files -n" command to get the memory distribution information:
1.) Add new argument for dump_inode_page_cache_info()
2.) make page_to_nid() a global function.
3.) Add summary_inode_page() to check each page's node
information.
4.) Use print_inode_summary_info() to print the
memory distribution information of an inode.
Signed-off-by: Huang Shijie <huangsj@hygon.cn>
---
defs.h | 1 +
filesys.c | 60 ++++++++++++++++++++++++++++++++++++++++++++++++++-----
help.c | 24 +++++++++++++++++++++-
memory.c | 4 ++--
4 files changed, 81 insertions(+), 8 deletions(-)
diff --git a/defs.h b/defs.h
index e7e97e7d80b2..6373ee1831af 100644
--- a/defs.h
+++ b/defs.h
@@ -5948,6 +5948,7 @@ int dump_inode_page(ulong);
ulong valid_section_nr(ulong);
void display_memory_from_file_offset(ulonglong, long, void *);
void swap_info_init(void);
+int page_to_nid(ulong);
/*
* filesys.c
diff --git a/filesys.c b/filesys.c
index 35d55a543739..7ff47876bbb7 100644
--- a/filesys.c
+++ b/filesys.c
@@ -49,7 +49,7 @@ static int match_file_string(char *, char *, char *);
static ulong get_root_vfsmount(char *);
static void check_live_arch_mismatch(void);
static long get_inode_nrpages(ulong);
-static void dump_inode_page_cache_info(ulong);
+static void dump_inode_page_cache_info(ulong, void *callback);
#define DENTRY_CACHE (20)
#define INODE_CACHE (20)
@@ -2240,8 +2240,38 @@ get_inode_nrpages(ulong i_mapping)
return nrpages;
}
+/* Used to collect the numa information for an inode */
+static ulong *numa_node;
+
static void
-dump_inode_page_cache_info(ulong inode)
+print_inode_summary_info(void)
+{
+ int i;
+
+ fprintf(fp, " NODE PAGES\n");
+ for (i = 0; i < vt->numnodes; i++)
+ fprintf(fp, " %2d %8ld\n", i, numa_node[i]);
+}
+
+static int
+summary_inode_page(ulong page)
+{
+ int node;
+
+ if (!is_page_ptr(page, NULL))
+ error(FATAL, "Invalid inode page(0x%lx)\n", page);
+
+ node = page_to_nid(page);
+ if (node < 0 || node >= vt->numnodes)
+ error(FATAL, "Invalid node(%d) for page(0x%lx)\n", node, page);
+
+ numa_node[node] += 1 << folio_order(page);
+
+ return 1;
+}
+
+static void
+dump_inode_page_cache_info(ulong inode, void *callback)
{
char *inode_buf;
ulong i_mapping, nrpages, root_rnode, xarray, count;
@@ -2284,7 +2314,7 @@ dump_inode_page_cache_info(ulong inode)
root_rnode = i_mapping + OFFSET(address_space_page_tree);
lp.index = 0;
- lp.value = (void *)&dump_inode_page;
+ lp.value = callback;
if (root_rnode)
count = do_radix_tree(root_rnode, RADIX_TREE_DUMP_CB, &lp);
@@ -2324,7 +2354,7 @@ cmd_files(void)
ref = NULL;
refarg = NULL;
- while ((c = getopt(argcnt, args, "d:R:p:c")) != EOF) {
+ while ((c = getopt(argcnt, args, "d:n:R:p:c")) != EOF) {
switch(c)
{
case 'R':
@@ -2343,11 +2373,31 @@ cmd_files(void)
display_dentry_info(value);
return;
+ case 'n':
+ if (VALID_MEMBER(address_space_page_tree) &&
+ VALID_MEMBER(inode_i_mapping)) {
+ value = htol(optarg, FAULT_ON_ERROR, NULL);
+
+ /* Allocate the array for this inode */
+ numa_node = (ulong *)GETBUF(sizeof(ulong) * vt->numnodes);
+ BZERO(numa_node, sizeof(ulong) * vt->numnodes);
+
+ dump_inode_page_cache_info(value, (void *)&summary_inode_page);
+
+ /* Print out the NUMA node information for this inode */
+ print_inode_summary_info();
+
+ FREEBUF(numa_node);
+ numa_node = NULL;
+ } else
+ option_not_supported('n');
+ return;
+
case 'p':
if (VALID_MEMBER(address_space_page_tree) &&
VALID_MEMBER(inode_i_mapping)) {
value = htol(optarg, FAULT_ON_ERROR, NULL);
- dump_inode_page_cache_info(value);
+ dump_inode_page_cache_info(value, (void *)&dump_inode_page);
} else
option_not_supported('p');
return;
diff --git a/help.c b/help.c
index 810075b97f35..5cd5c30e99a3 100644
--- a/help.c
+++ b/help.c
@@ -7900,7 +7900,7 @@ NULL
char *help_files[] = {
"files",
"open files",
-"[-d dentry] | [-p inode] | [-c] [-R reference] [pid | taskp] ... ",
+"[-d dentry] | [-p inode] | [-n inode]|[-c] [-R reference] [pid | taskp] ... ",
" This command displays information about open files of a context.",
" It prints the context's current root directory and current working",
" directory, and then for each open file descriptor it prints a pointer",
@@ -7915,6 +7915,8 @@ char *help_files[] = {
" super block, file type, and full pathname.",
" -p inode given a hexadecimal inode address, dump all of its pages",
" that are in the page cache.",
+" -n inode given a hexadecimal inode address, check all the pages",
+" in the page cache, and display a NUMA node distribution.",
" -c for each open file descriptor, prints a pointer to its",
" inode, a pointer to the inode's i_mapping address_space",
" structure, the number of pages of the inode that are in",
@@ -8024,6 +8026,26 @@ char *help_files[] = {
" ca1ddde0 2eeef000 f59b91ac 3 2 82c referenced,uptodate,lru,private",
" ca36b300 3b598000 f59b91ac 4 2 82c referenced,uptodate,lru,private",
" ca202680 30134000 f59b91ac 5 2 82c referenced,uptodate,lru,private",
+" ",
+" For the inode at address ffff8898857c55a8, display the NUMA node",
+" distribution of its pages that are in the page cache:",
+" %s> files -n ffff8898857c55a8",
+" INODE NRPAGES",
+" ffff8898857c55a8 51748",
+" ",
+" NODE PAGES",
+" 0 51536",
+" 1 0",
+" 2 0",
+" 3 0",
+" 4 0",
+" 5 212",
+" 6 0",
+" 7 0",
+" 8 0",
+" 9 0",
+" 10 0",
+" 11 0",
" ",
NULL
};
diff --git a/memory.c b/memory.c
index 502f8fdd0ea7..38c6a139e984 100644
--- a/memory.c
+++ b/memory.c
@@ -301,7 +301,7 @@ static int dump_vm_event_state(void);
static int dump_page_states(void);
static int generic_read_dumpfile(ulonglong, void *, long, char *, ulong);
static int generic_write_dumpfile(ulonglong, void *, long, char *, ulong);
-static int page_to_nid(ulong);
+int page_to_nid(ulong);
static int get_kmem_cache_list(ulong **);
static int get_kmem_cache_root_list(ulong **);
static int get_kmem_cache_child_list(ulong **, ulong);
@@ -20093,7 +20093,7 @@ is_kmem_cache_addr_common(ulong vaddr, char *kbuf)
/*
* Kernel-config-neutral page-to-node evaluator.
*/
-static int
+int
page_to_nid(ulong page)
{
int i;
--
2.54.0
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