On Thu, Sep 12, 2024 at 11:41 AM <devel-request@xxxxxxxxxxxxxxxxxxxxxxxxxxx> wrote:
Date: Thu, 12 Sep 2024 03:36:53 -0000
From: qiwu.chen@xxxxxxxxxxxxx
Subject: [PATCH v2 1/2] kmem: introduce -t flag to get
page owner
To: devel@xxxxxxxxxxxxxxxxxxxxxxxxxxx
Message-ID: <20240912033653.15869.73753@xxxxxxxxxxxxxxxxxxxxxxxxxxx>
Content-Type: text/plain; charset="utf-8"
Introduce -t flag for kmem command to get page owner.
Thank you for the patch, qiwu.
Kazu implemented an owner command (see: page_owner.c), which is a similar feature, please refer to this section: page_owner.c
Thanks
Lianbo
Here is the user help manual:
1. Dump page_owner allocated stack trace for each allocated page in
buddy system when used with "kmem -pt":
crash> kmem -pt
Page allocated via order 0, mask 0x1112c4a, pid 1, ts 16155269152 ns
PFN 0x40000, type Movable, Flags 0xffff00000020836
set_page_owner+84
post_alloc_hook+308
prep_new_page+48
get_page_from_freelist+736
__alloc_pages+348
alloc_pages+280
__page_cache_alloc+120
page_cache_ra_unbounded+272
do_page_cache_ra+172
do_sync_mmap_readahead+492
filemap_fault+340
__do_fault+64
__handle_mm_fault+528
handle_mm_fault+208
__do_page_fault+232
do_page_fault+1264
......
2. Dump page_owner allocated/freed trace for an allocated page when used
"kmem -pt" with a page address.
crash> kmem -pt fffffc00001f9e40
PAGE PHYSICAL MAPPING INDEX CNT FLAGS
fffffc00001f9e40 47e79000 dead000000000008 0 0 ffff00000000000
page_owner tracks the page 0xfffffc00001f9e40 as allocated
Page allocated via order 3, mask 0xd20c0, pid 163, ts 39197221904 ns
PFN 0x47e79, type Unmovable, Flags 0xffff00000000000
set_page_owner+84
post_alloc_hook+308
prep_new_page+48
get_page_from_freelist+736
__alloc_pages+348
alloc_pages+280
alloc_slab_page+60
allocate_slab+212
new_slab+200
___slab_alloc+1432
__slab_alloc+60
kmem_cache_alloc_node+528
alloc_task_struct_node+36
dup_task_struct+56
copy_process+724
kernel_clone+276
page last free ts 38730338480 ns, stack trace:
set_page_owner+84
post_alloc_hook+308
prep_new_page+48
get_page_from_freelist+736
__alloc_pages+348
alloc_pages+280
alloc_slab_page+60
allocate_slab+212
new_slab+200
___slab_alloc+1432
__slab_alloc+60
kmem_cache_alloc_node+528
alloc_task_struct_node+36
dup_task_struct+56
copy_process+724
kernel_clone+276
With this patch, the page allocation times can be sorted by page_owner_sort
tool easily.
Signed-off-by: qiwu.chen <qiwu.chen@xxxxxxxxxxxxx>
---
defs.h | 43 ++++++
help.c | 4 +-
memory.c | 434 ++++++++++++++++++++++++++++++++++++++++++++++++++++---
3 files changed, 461 insertions(+), 20 deletions(-)
diff --git a/defs.h b/defs.h
index 2231cb6..3d729c8 100644
--- a/defs.h
+++ b/defs.h
@@ -206,6 +206,34 @@ static inline int string_exists(char *s) { return (s ? TRUE : FALSE); }
#undef roundup
#endif
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
+#define __round_mask(x, y) ((__typeof__(x))((y)-1))
+#define rounddown(x, y) ((x) & ~__round_mask(x, y))
+#define IS_ALIGNED(x, y) (((x) & ((typeof(x))(y) - 1)) == 0)
+
+/* stack depot macros before kernel commit 8151c7a35d8bd */
+#define STACK_ALLOC_ALIGN 4
+#define STACK_ALLOC_NULL_PROTECTION_BITS 1
+#define STACK_ALLOC_ORDER 2 /* 'Slab' size order for stack depot, 4 pages */
+#define STACK_ALLOC_OFFSET_BITS (STACK_ALLOC_ORDER + PAGESHIFT() - STACK_ALLOC_ALIGN)
+#define DEPOT_STACK_BITS (sizeof(uint) * 8)
+#define STACK_ALLOC_INDEX_BITS (DEPOT_STACK_BITS - \
+ STACK_ALLOC_NULL_PROTECTION_BITS - STACK_ALLOC_OFFSET_BITS)
+
+/* stack depot macros since kernel commit 8151c7a35d8bd */
+#define STACK_DEPOT_EXTRA_BITS 5
+#define DEPOT_HANDLE_BITS (sizeof(uint) * 8)
+#define DEPOT_POOL_ORDER 2 /* Pool size order, 4 pages */
+#define DEPOT_POOL_SIZE (1LL << (PAGESHIFT() + DEPOT_POOL_ORDER))
+#define DEPOT_STACK_ALIGN 4
+#define DEPOT_OFFSET_BITS (DEPOT_POOL_ORDER + PAGESHIFT() - DEPOT_STACK_ALIGN)
+#define DEPOT_POOL_INDEX_BITS (DEPOT_HANDLE_BITS - DEPOT_OFFSET_BITS - \
+ STACK_DEPOT_EXTRA_BITS)
+
+/* GFP flags */
+#define __GFP_RECLAIMABLE 0x10u
+#define __GFP_MOVABLE 0x08u
+#define GFP_MOVABLE_MASK (__GFP_RECLAIMABLE|__GFP_MOVABLE)
+#define GFP_MOVABLE_SHIFT 3
typedef uint64_t physaddr_t;
@@ -2243,6 +2271,18 @@ struct offset_table { /* stash of commonly-used offsets */
long vmap_node_busy;
long rb_list_head;
long file_f_inode;
+ long pglist_data_node_page_ext;
+ long stack_record_size;
+ long stack_record_entries;
+ long stack_record_count;
+ long page_owner_order;
+ long page_owner_gfp_mask;
+ long page_owner_ts_nsec;
+ long page_owner_free_ts_nsec;
+ long page_owner_pid;
+ long page_owner_handle;
+ long page_owner_free_handle;
+ long mem_section_page_ext;
};
struct size_table { /* stash of commonly-used sizes */
@@ -2419,6 +2459,9 @@ struct size_table { /* stash of commonly-used sizes */
long module_memory;
long fred_frame;
long vmap_node;
+ long page_ext;
+ long page_owner;
+ long stack_record;
};
struct array_table {
diff --git a/help.c b/help.c
index e95ac1d..f8ec62f 100644
--- a/help.c
+++ b/help.c
@@ -6815,7 +6815,7 @@ NULL
char *help_kmem[] = {
"kmem",
"kernel memory",
-"[-f|-F|-c|-C|-i|-v|-V|-n|-z|-o|-h] [-p | -m member[,member]]\n"
+"[-f|-F|-c|-C|-i|-v|-V|-n|-z|-o|-h] [-p|-t | -m member[,member]]\n"
" [[-s|-S|-S=cpu[s]|-r] [slab] [-I slab[,slab]]] [-g [flags]] [[-P] address]]",
" This command displays information about the use of kernel memory.\n",
" -f displays the contents of the system free memory headers.",
@@ -6845,6 +6845,7 @@ char *help_kmem[] = {
" mem_map[] array, made up of the page struct address, its associated",
" physical address, the page.mapping, page.index, page._count and",
" page.flags fields.",
+" -t displays page_owner allocated stack trace for each allocated page.",
" -m member similar to -p, but displays page structure contents specified by",
" a comma-separated list of one or more struct page members. The",
" \"flags\" member will always be expressed in hexadecimal format, and",
@@ -6899,6 +6900,7 @@ char *help_kmem[] = {
" address when used with -p, the address can be either a page pointer, a",
" physical address, or a kernel virtual address; its basic mem_map",
" page information is displayed.",
+" when added extra -t, display the page_owner traces for this page",
" address when used with -m, the address can be either a page pointer, a",
" physical address, or a kernel virtual address; the specified",
" members of the associated page struct are displayed.",
diff --git a/memory.c b/memory.c
index 967a9cf..6c69b6a 100644
--- a/memory.c
+++ b/memory.c
@@ -323,6 +323,11 @@ static ulong kmem_cache_nodelists(ulong);
static void dump_hstates(void);
static ulong freelist_ptr(struct meminfo *, ulong, ulong);
static ulong handle_each_vm_area(struct handle_each_vm_area_args *);
+static void page_owner_init(void);
+static int page_owner_enabled(void);
+static void stack_depot_init(void);
+static void dump_page_owner(struct meminfo *, ulong, physaddr_t);
+enum track_item { TRACK_ALLOC, TRACK_FREE, TRACK_ALL };
/*
* Memory display modes specific to this file.
@@ -983,6 +988,8 @@ vm_init(void)
vt->flags |= DISCONTIGMEM;
sparse_mem_init();
+ page_owner_init();
+ stack_depot_init();
vt->vmalloc_start = machdep->vmalloc_start();
if (IS_VMALLOC_ADDR(vt->mem_map))
@@ -1099,6 +1106,8 @@ vm_init(void)
MEMBER_OFFSET_INIT(pglist_data_bdata, "pglist_data", "bdata");
MEMBER_OFFSET_INIT(pglist_data_nr_zones, "pglist_data",
"nr_zones");
+ MEMBER_OFFSET_INIT(pglist_data_node_page_ext, "pglist_data",
+ "node_page_ext");
MEMBER_OFFSET_INIT(pglist_data_node_start_pfn, "pglist_data",
"node_start_pfn");
MEMBER_OFFSET_INIT(pglist_data_pgdat_next, "pglist_data",
@@ -5037,6 +5046,7 @@ get_task_mem_usage(ulong task, struct task_mem_usage *tm)
#define SLAB_BITFIELD (ADDRESS_SPECIFIED << 25)
#define SLAB_GATHER_FAILURE (ADDRESS_SPECIFIED << 26)
#define GET_SLAB_ROOT_CACHES (ADDRESS_SPECIFIED << 27)
+#define GET_PAGE_OWNER (ADDRESS_SPECIFIED << 28)
#define GET_ALL \
(GET_SHARED_PAGES|GET_TOTALRAM_PAGES|GET_BUFFERS_PAGES|GET_SLAB_PAGES)
@@ -5048,7 +5058,7 @@ cmd_kmem(void)
int c;
int sflag, Sflag, pflag, fflag, Fflag, vflag, zflag, oflag, gflag;
int nflag, cflag, Cflag, iflag, lflag, Lflag, Pflag, Vflag, hflag;
- int rflag;
+ int rflag, tflag;
struct meminfo meminfo;
ulonglong value[MAXARGS];
char buf[BUFSIZE];
@@ -5061,13 +5071,13 @@ cmd_kmem(void)
spec_addr = choose_cpu = 0;
sflag = Sflag = pflag = fflag = Fflag = Pflag = zflag = oflag = 0;
vflag = Cflag = cflag = iflag = nflag = lflag = Lflag = Vflag = 0;
- gflag = hflag = rflag = 0;
+ gflag = hflag = rflag = tflag = 0;
escape = FALSE;
BZERO(&meminfo, sizeof(struct meminfo));
BZERO(&value[0], sizeof(ulonglong)*MAXARGS);
pc->curcmd_flags &= ~HEADER_PRINTED;
- while ((c = getopt(argcnt, args, "gI:sS::rFfm:pvczCinl:L:PVoh")) != EOF) {
+ while ((c = getopt(argcnt, args, "gI:sS::rFfm:pvczCinl:L:PVoht")) != EOF) {
switch(c)
{
case 'V':
@@ -5204,6 +5214,10 @@ cmd_kmem(void)
gflag = 1;
break;
+ case 't':
+ tflag = 1;
+ break;
+
default:
argerrs++;
break;
@@ -5213,7 +5227,7 @@ cmd_kmem(void)
if (argerrs)
cmd_usage(pc->curcmd, SYNOPSIS);
- if ((sflag + Sflag + pflag + fflag + Fflag + Vflag + oflag +
+ if ((fflag + Fflag + Vflag + oflag +
vflag + Cflag + cflag + iflag + lflag + Lflag + gflag +
hflag + rflag) > 1) {
error(INFO, "only one flag allowed!\n");
@@ -5264,10 +5278,13 @@ cmd_kmem(void)
if (pflag) {
meminfo.spec_addr = value[i];
meminfo.flags = ADDRESS_SPECIFIED;
+ if (tflag)
+ meminfo.flags |= GET_PAGE_OWNER;
dump_mem_map(&meminfo);
pflag++;
}
+
if (sflag || Sflag) {
if (vt->flags & KMEM_CACHE_UNAVAIL)
error(FATAL,
@@ -5346,25 +5363,25 @@ cmd_kmem(void)
gflag++;
}
- /*
- * no value arguments allowed!
- */
- if (zflag || nflag || iflag || Fflag || Cflag || Lflag ||
+ /*
+ * no value arguments allowed!
+ */
+ if (zflag || nflag || iflag || Fflag || Cflag || Lflag ||
Vflag || oflag || hflag || rflag) {
error(INFO,
"no address arguments allowed with this option\n");
cmd_usage(pc->curcmd, SYNOPSIS);
}
- if (!(sflag + Sflag + pflag + fflag + vflag + cflag +
- lflag + Lflag + gflag)) {
+ if (!(sflag + Sflag + pflag + fflag + vflag + cflag +
+ lflag + Lflag + gflag + tflag)) {
meminfo.spec_addr = value[i];
- meminfo.flags = ADDRESS_SPECIFIED;
- if (meminfo.calls++)
- fprintf(fp, "\n");
+ meminfo.flags = ADDRESS_SPECIFIED;
+ if (meminfo.calls++)
+ fprintf(fp, "\n");
else
kmem_cache_init();
- kmem_search(&meminfo);
+ kmem_search(&meminfo);
}
}
@@ -5372,8 +5389,11 @@ cmd_kmem(void)
if (iflag == 1)
dump_kmeminfo();
- if (pflag == 1)
+ if (pflag == 1) {
+ if (tflag)
+ meminfo.flags = GET_PAGE_OWNER;
dump_mem_map(&meminfo);
+ }
if (fflag == 1)
vt->dump_free_pages(&meminfo);
@@ -5457,7 +5477,7 @@ cmd_kmem(void)
if (!(sflag + Sflag + pflag + fflag + Fflag + vflag +
Vflag + zflag + oflag + cflag + Cflag + iflag +
nflag + lflag + Lflag + gflag + hflag + rflag +
- meminfo.calls))
+ tflag + meminfo.calls))
cmd_usage(pc->curcmd, SYNOPSIS);
}
@@ -5749,7 +5769,8 @@ dump_mem_map_SPARSEMEM(struct meminfo *mi)
switch (mi->flags)
{
- case ADDRESS_SPECIFIED:
+ case ADDRESS_SPECIFIED:
+ case ADDRESS_SPECIFIED|GET_PAGE_OWNER:
switch (mi->memtype)
{
case KVADDR:
@@ -5774,6 +5795,10 @@ dump_mem_map_SPARSEMEM(struct meminfo *mi)
print_hdr = TRUE;
break;
+ case GET_PAGE_OWNER:
+ print_hdr = FALSE;
+ break;
+
case GET_ALL:
shared = 0;
reserved = 0;
@@ -5959,6 +5984,10 @@ dump_mem_map_SPARSEMEM(struct meminfo *mi)
shared++;
}
continue;
+
+ case GET_PAGE_OWNER:
+ dump_page_owner(mi, pp, phys);
+ continue;
}
page_mapping = VALID_MEMBER(page_mapping);
@@ -6083,6 +6112,7 @@ display_members:
if (done)
break;
+
}
if (done)
@@ -6119,7 +6149,10 @@ display_members:
break;
case ADDRESS_SPECIFIED:
+ case ADDRESS_SPECIFIED|GET_PAGE_OWNER:
mi->retval = done;
+ if (mi->flags & GET_PAGE_OWNER)
+ dump_page_owner(mi, pp, phys);
break;
}
@@ -6129,6 +6162,345 @@ display_members:
FREEBUF(page_cache);
}
+static int stack_depot_enabled(void)
+{
+ struct syment *sp;
+ int disable = TRUE;
+
+ if ((sp = symbol_search("stack_depot_disable")))
+ readmem(sp->value, KVADDR, &disable, sizeof(int),
+ "stack_depot_disable", RETURN_ON_ERROR);
+ else if ((sp = symbol_search("stack_depot_disabled")))
+ readmem(sp->value, KVADDR, &disable, sizeof(int),
+ "stack_depot_disabled", RETURN_ON_ERROR);
+ else if ((sp = symbol_search("stack_slabs")))
+ return sp->value ? FALSE : TRUE;
+
+ return !disable;
+}
+
+static void stack_depot_init(void)
+{
+ if (stack_depot_enabled()) {
+ STRUCT_SIZE_INIT(stack_record, "stack_record");
+ MEMBER_OFFSET_INIT(stack_record_size, "stack_record", "size");
+ MEMBER_OFFSET_INIT(stack_record_entries, "stack_record", "entries");
+ if (MEMBER_EXISTS("stack_record", "count"))
+ MEMBER_OFFSET_INIT(stack_record_count, "stack_record", "count");
+ }
+}
+
+/* Fetch stack entries from a depot. */
+static unsigned int stack_depot_fetch(uint handle, ulong *entries)
+{
+ struct syment *sp;
+ uint valid, offset, slabindex, poolindex, pools_num, stack_record_count;
+ uint stack_size = 0;
+ ulong stack_record_addr, sym_value;
+
+ if (!handle)
+ return 0;
+
+ if ((sp = symbol_search("stack_slabs"))) {
+ valid = (handle >> (STACK_ALLOC_INDEX_BITS + STACK_ALLOC_OFFSET_BITS))
+ & STACK_ALLOC_NULL_PROTECTION_BITS;
+ if (!valid)
+ return 0;
+
+ slabindex = handle & ((1 << STACK_ALLOC_INDEX_BITS) - 1);
+ readmem(sp->value + slabindex * sizeof(void *), KVADDR, &stack_record_addr,
+ sizeof(void *), "stack_record_addr", FAULT_ON_ERROR);
+
+ offset = (handle >> STACK_ALLOC_INDEX_BITS) &
+ ((1 << STACK_ALLOC_OFFSET_BITS) - 1);
+ stack_record_addr += (offset << STACK_ALLOC_ALIGN);
+ *entries = stack_record_addr + OFFSET(stack_record_entries);
+ readmem(stack_record_addr + OFFSET(stack_record_size), KVADDR, &stack_size,
+ sizeof(stack_size), "stack_record_entries", FAULT_ON_ERROR);
+ } else if ((sp = symbol_search("stack_pools")) &&
+ (sym_value = symbol_value("pools_num"))) {
+ poolindex = handle & ((1 << DEPOT_POOL_INDEX_BITS) - 1);
+ readmem(sym_value, KVADDR, &pools_num, sizeof(int),
+ "pools_num", RETURN_ON_ERROR);
+ if (poolindex >= pools_num) {
+ error(INFO, "pool index %d out of bounds (%d) for stack id %08x\n",
+ poolindex, pools_num, handle);
+ return 0;
+ }
+
+ readmem(sp->value + (poolindex-1) * sizeof(void *), KVADDR, &stack_record_addr,
+ sizeof(void *), "stack_record_addr", FAULT_ON_ERROR);
+ if (!stack_record_addr)
+ return 0;
+
+ offset = (handle >> DEPOT_POOL_INDEX_BITS) & ((1 << DEPOT_OFFSET_BITS) - 1);
+ stack_record_addr += (offset << DEPOT_STACK_ALIGN);
+ readmem(stack_record_addr + OFFSET(stack_record_count), KVADDR, &stack_record_count,
+ sizeof(stack_record_count), "stack_record_count", FAULT_ON_ERROR);
+ if (!stack_record_count)
+ return 0;
+
+ *entries = stack_record_addr + OFFSET(stack_record_entries);
+ readmem(stack_record_addr + OFFSET(stack_record_size), KVADDR, &stack_size,
+ sizeof(stack_size), "stack_record_entries", FAULT_ON_ERROR);
+ }
+
+ return stack_size;
+}
+
+static void stack_trace_print(ulong entries, uint nr_entries)
+{
+ int i;
+ struct syment *sp;
+ ulong value, offset;
+ char buf[BUFSIZE];
+
+ if (!nr_entries)
+ return;
+
+ for (i = 0; i < nr_entries; i++) {
+ if (!readmem(entries, KVADDR, &value, sizeof(value),
+ "stack_trace", FAULT_ON_ERROR))
+ break;
+
+ entries += sizeof(ulong);
+ sp = value_search(value, &offset);
+ if (!sp)
+ break;
+
+ fprintf(fp, "%s\n", value_to_symstr(sp->value+offset, buf, 0));
+ }
+ fprintf(fp, "\n");
+}
+
+static ulong gfp_migratetype(ulong gfp_flags)
+{
+ struct syment *sp;
+ int page_group_by_mobility_disabled;
+
+ if ((sp = symbol_search("page_group_by_mobility_disabled"))) {
+ readmem(sp->value, KVADDR, &page_group_by_mobility_disabled, sizeof(int),
+ "page_group_by_mobility_disabled", RETURN_ON_ERROR);
+ if (page_group_by_mobility_disabled) {
+ ulong migrate_unmovable;
+
+ enumerator_value("MIGRATE_UNMOVABLE", &migrate_unmovable);
+ return migrate_unmovable;
+ }
+ }
+
+ return (gfp_flags & GFP_MOVABLE_MASK) >> GFP_MOVABLE_SHIFT;
+}
+
+static void migratetype_name(ulong migratetype, char *buf)
+{
+ struct syment *sp;
+ ulong migratetype_name_addr;
+
+ sp = symbol_search("migratetype_names");
+ if (!sp)
+ return;
+
+ readmem(sp->value + migratetype * sizeof(ulong), KVADDR, &migratetype_name_addr,
+ sizeof(ulong), "migratetype_name", RETURN_ON_ERROR);
+ read_string(migratetype_name_addr, buf, BUFSIZE-1);
+}
+
+static void print_page_owner(ulong pfn, ulong page, char *page_owner, enum track_item alloc)
+{
+ int i, pid;
+ ushort order;
+ uint handle, free_handle, gfp_mask, nr_entries;
+ u64 ts_nsec, free_ts_nsec;
+ ulong entries, offset, page_flags;
+ struct syment *sp;
+ char buf[BUFSIZE];
+
+ order = USHORT(page_owner + OFFSET(page_owner_order));
+ gfp_mask = UINT(page_owner + OFFSET(page_owner_gfp_mask));
+ handle = UINT(page_owner + OFFSET(page_owner_handle));
+ free_handle = UINT(page_owner + OFFSET(page_owner_free_handle));
+ ts_nsec = ULONGLONG(page_owner + OFFSET(page_owner_ts_nsec));
+ free_ts_nsec = ULONGLONG(page_owner + OFFSET(page_owner_free_ts_nsec));
+ pid = INT(page_owner + OFFSET(page_owner_pid));
+
+ if (handle && (alloc != TRACK_FREE)) {
+ fprintf(fp, "Page allocated via order %u, mask %#x, pid %d, ts %llu ns\n",
+ order, gfp_mask, pid, ts_nsec);
+ migratetype_name(gfp_migratetype(gfp_mask), buf);
+ readmem(page+OFFSET(page_flags), KVADDR, &page_flags, sizeof(ulong),
+ "page.flags", FAULT_ON_ERROR);
+ fprintf(fp, "PFN %#lx, type %s, Flags %#lx\n", pfn, buf, page_flags);
+ nr_entries = stack_depot_fetch(handle, &entries);
+ stack_trace_print(entries, nr_entries);
+ }
+
+ if (alloc != TRACK_ALLOC &&
+ (free_handle = UINT(page_owner + OFFSET(page_owner_free_handle)))) {
+ nr_entries = stack_depot_fetch(handle, &entries);
+ fprintf(fp, "page last free ts %llu ns, stack trace:\n", free_ts_nsec);
+ stack_trace_print(entries, nr_entries);
+ }
+}
+
+/* Get the max order for zoned buddy allocator */
+static inline ulong get_max_order(void)
+{
+ char *string;
+
+ if ((kt->ikconfig_flags & IKCONFIG_AVAIL) &&
+ get_kernel_config("CONFIG_FORCE_MAX_ZONEORDER", &string) == IKCONFIG_STR)
+ return atol(string);
+
+ return 11;
+}
+
+#define MAX_ORDER get_max_order()
+#define MAX_ORDER_NR_PAGES (1 << (MAX_ORDER - 1))
+
+static int lookup_page_ext(ulong pfn, ulong pp, ulong *page_ext)
+{
+ int node;
+ ulong page_ext_size, section, section_nr, pgdat;
+ ulong node_page_ext, node_start_pfn, page_ext_idx;
+
+ if (!kernel_symbol_exists("page_ext_size"))
+ return FALSE;
+
+ readmem(symbol_value("page_ext_size"), KVADDR, &page_ext_size,
+ sizeof(page_ext_size), "page_ext_size", FAULT_ON_ERROR);
+
+ if (IS_SPARSEMEM()) {
+ section_nr = pfn_to_section_nr(pfn);
+ if (!(section = valid_section_nr(section_nr)))
+ return FALSE;
+
+ readmem(section + OFFSET(mem_section_page_ext), KVADDR, &node_page_ext,
+ sizeof(ulong), "mem_section page_ext", FAULT_ON_ERROR);
+ if (!node_page_ext)
+ return FALSE;
+
+ *page_ext = node_page_ext + pfn * page_ext_size;
+ return TRUE;
+ }
+
+ if ((node = page_to_nid(pp) >= 0)) {
+ pgdat = vt->node_table[node].pgdat;
+ if (!VALID_MEMBER(pglist_data_node_page_ext) ||
+ !VALID_MEMBER(pglist_data_node_start_pfn))
+ return FALSE;
+
+ readmem(pgdat + OFFSET(pglist_data_node_page_ext), KVADDR, &node_page_ext,
+ sizeof(ulong), "pglist node_page_ext", FAULT_ON_ERROR);
+ if (!node_page_ext)
+ return FALSE;
+
+ readmem(pgdat + OFFSET(pglist_data_node_start_pfn), KVADDR, &node_start_pfn,
+ sizeof(ulong), "pglist node_start_pfn", FAULT_ON_ERROR);
+ if (!node_start_pfn)
+ return FALSE;
+
+ page_ext_idx = pfn - rounddown(node_start_pfn, MAX_ORDER_NR_PAGES);
+ *page_ext = node_page_ext + pfn * page_ext_size;
+ return TRUE;
+ }
+
+ return FALSE;
+}
+
+static ulong get_page_owner(ulong page_ext)
+{
+ struct syment *sp;
+ ulong page_owner_ops_offset;
+
+ sp = symbol_search("page_owner_ops");
+ if (!sp)
+ return FALSE;
+
+ readmem(sp->value, KVADDR, &page_owner_ops_offset, sizeof(ulong),
+ "page_owner_ops_offset", RETURN_ON_ERROR);
+
+ return page_ext + page_owner_ops_offset;
+}
+
+static int page_owner_enabled(void)
+{
+ struct syment *sp;
+ int enabled;
+
+ if ((sp = symbol_search("page_owner_enabled")) &&
+ readmem(sp->value, KVADDR, &enabled, sizeof(int),
+ "page_owner_enabled", RETURN_ON_ERROR))
+ return enabled;
+
+ if ((sp = symbol_search("page_owner_inited")) &&
+ readmem(sp->value, KVADDR, &enabled, sizeof(int),
+ "page_owner_inited", RETURN_ON_ERROR))
+ return enabled;
+
+ return FALSE;
+}
+
+static void page_owner_init(void)
+{
+ if (page_owner_enabled()) {
+ STRUCT_SIZE_INIT(page_ext, "page_ext");
+ STRUCT_SIZE_INIT(page_owner, "page_owner");
+ MEMBER_OFFSET_INIT(mem_section_page_ext, "mem_section", "page_ext");
+ MEMBER_OFFSET_INIT(page_owner_handle, "page_owner", "handle");
+ MEMBER_OFFSET_INIT(page_owner_free_handle, "page_owner", "free_handle");
+ MEMBER_OFFSET_INIT(page_owner_order, "page_owner", "order");
+ MEMBER_OFFSET_INIT(page_owner_gfp_mask, "page_owner", "gfp_mask");
+ MEMBER_OFFSET_INIT(page_owner_ts_nsec, "page_owner", "ts_nsec");
+ MEMBER_OFFSET_INIT(page_owner_free_ts_nsec, "page_owner", "free_ts_nsec");
+ MEMBER_OFFSET_INIT(page_owner_pid, "page_owner", "pid");
+ }
+}
+
+static void dump_page_owner(struct meminfo *mi, ulong pp, physaddr_t phys)
+{
+ ulong pfn, page_ext_addr, page_owner_addr, page_ext;
+ long page_ext_owner, page_ext_owner_allocated;
+ char *page_owner;
+
+ pfn = BTOP(phys);
+ if (!lookup_page_ext(pfn, pp, &page_ext_addr))
+ return;
+
+ page_owner_addr = get_page_owner(page_ext_addr);
+ if (!page_owner_addr)
+ return;
+
+ page_owner = (char *)GETBUF(SIZE(page_owner));
+ readmem(page_owner_addr, KVADDR, page_owner, SIZE(page_owner),
+ "page_owner", FAULT_ON_ERROR);
+
+ enumerator_value("PAGE_EXT_OWNER", &page_ext_owner);
+ readmem(page_ext_addr, KVADDR, &page_ext, sizeof(ulong),
+ "page_ext", FAULT_ON_ERROR);
+ if (!(page_ext & (1 << page_ext_owner)))
+ goto exit;
+
+ enumerator_value("PAGE_EXT_OWNER_ALLOCATED", &page_ext_owner_allocated);
+ if (mi->flags == GET_PAGE_OWNER) {
+ if (!(page_ext & (1 << page_ext_owner_allocated)) ||
+ !IS_ALIGNED(pfn, 1 << USHORT(page_owner + OFFSET(page_owner_order))))
+ goto exit;
+
+ /* dump allocated page owner for current memory usage */
+ print_page_owner(pfn, pp, page_owner, TRACK_ALLOC);
+ } else {
+ if (page_ext & (1 << page_ext_owner_allocated))
+ fprintf(fp, "page_owner tracks the page 0x%lx as allocated\n", pp);
+ else
+ fprintf(fp, "page_owner tracks the page 0x%lx as freed\n", pp);
+ print_page_owner(pfn, pp, page_owner, TRACK_ALL);
+ }
+
+exit:
+ FREEBUF(page_owner);
+}
+
static void
dump_mem_map(struct meminfo *mi)
{
@@ -6161,6 +6533,19 @@ dump_mem_map(struct meminfo *mi)
char style3[100];
char style4[100];
+ if (mi->flags & GET_PAGE_OWNER) {
+ if (!page_owner_enabled()) {
+ error(INFO, "page_owner is disabled\n");
+ return;
+ }
+
+ /* TODO: support page owner for early kernels without stack depot */
+ if (!stack_depot_enabled()) {
+ error(INFO, "stack_depot is disabled\n");
+ return;
+ }
+ }
+
if (IS_SPARSEMEM()) {
dump_mem_map_SPARSEMEM(mi);
return;
@@ -6238,7 +6623,8 @@ dump_mem_map(struct meminfo *mi)
switch (mi->flags)
{
- case ADDRESS_SPECIFIED:
+ case ADDRESS_SPECIFIED:
+ case ADDRESS_SPECIFIED|GET_PAGE_OWNER:
switch (mi->memtype)
{
case KVADDR:
@@ -6263,6 +6649,10 @@ dump_mem_map(struct meminfo *mi)
print_hdr = TRUE;
break;
+ case GET_PAGE_OWNER:
+ print_hdr = FALSE;
+ break;
+
case GET_ALL:
shared = 0;
reserved = 0;
@@ -6376,6 +6766,10 @@ dump_mem_map(struct meminfo *mi)
/* FALLTHROUGH */
+ case GET_PAGE_OWNER:
+ dump_page_owner(mi, pp, phys);
+ break;
+
case GET_SLAB_PAGES:
if (v22) {
if ((flags >> v22_PG_Slab) & 1)
@@ -6570,7 +6964,10 @@ display_members:
break;
case ADDRESS_SPECIFIED:
+ case ADDRESS_SPECIFIED|GET_PAGE_OWNER:
mi->retval = done;
+ if (mi->flags & GET_PAGE_OWNER)
+ dump_page_owner(mi, pp, phys);
break;
}
@@ -19776,7 +20173,6 @@ do_slab_slub(struct meminfo *si, int verbose)
if (is_free && (cpu_slab >= 0))
fprintf(fp, "(cpu %d cache)", cpu_slab);
fprintf(fp, "\n");
-
}
return TRUE;
--
2.25.1
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