%pGp format is used to display 'flags' field of a struct page. However,
some page flags (i.e. PG_buddy, see page-flags.h for more details) are
stored in page_type field. To display human-readable output of page_type,
introduce %pGt format.
It is important to note the meaning of bits are different in page_type.
if page_type is 0xffffffff, no flags are set. Setting PG_buddy
(0x00000080) flag results in a page_type of 0xffffff7f. Clearing a bit
actually means setting a flag. Bits in page_type are inverted when
displaying type names.
Only values for which page_type_has_type() returns true are considered as
page_type, to avoid confusion with mapcount values. if it returns false,
only raw values are displayed and not page type names.
Link: https://lkml.kernel.org/r/20230130042514.2418-3-42.hyeyoo@gmail.com
Signed-off-by: Hyeonggon Yoo <42.hyeyoo@gmail.com>
Reviewed-by: Petr Mladek <pmladek@suse.com> [vsprintf part]
Cc: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: David Hildenbrand <david@redhat.com>
Cc: Joe Perches <joe@perches.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Matthew Wilcox <willy@infradead.org>
Cc: Sergey Senozhatsky <senozhatsky@chromium.org>
Cc: Steven Rostedt (Google) <rostedt@goodmis.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Helper macros cpumask_pr_args() and nodemask_pr_args() are available to ease
printing cpumask and nodemask.
-Flags bitfields such as page flags, gfp_flags
----------------------------------------------
+Flags bitfields such as page flags, page_type, gfp_flags
+--------------------------------------------------------
::
%pGp 0x17ffffc0002036(referenced|uptodate|lru|active|private|node=0|zone=2|lastcpupid=0x1fffff)
+ %pGt 0xffffff7f(buddy)
%pGg GFP_USER|GFP_DMA32|GFP_NOWARN
%pGv read|exec|mayread|maywrite|mayexec|denywrite
For printing flags bitfields as a collection of symbolic constants that
would construct the value. The type of flags is given by the third
-character. Currently supported are [p]age flags, [v]ma_flags (both
-expect ``unsigned long *``) and [g]fp_flags (expects ``gfp_t *``). The flag
-names and print order depends on the particular type.
+character. Currently supported are:
+
+ - p - [p]age flags, expects value of type (``unsigned long *``)
+ - t - page [t]ype, expects value of type (``unsigned int *``)
+ - v - [v]ma_flags, expects value of type (``unsigned long *``)
+ - g - [g]fp_flags, expects value of type (``gfp_t *``)
+
+The flag names and print order depends on the particular type.
Note that this format should not be used directly in the
:c:func:`TP_printk()` part of a tracepoint. Instead, use the show_*_flags()
#define PageType(page, flag) \
((page->page_type & (PAGE_TYPE_BASE | flag)) == PAGE_TYPE_BASE)
+static inline int page_type_has_type(unsigned int page_type)
+{
+ return (int)page_type < PAGE_MAPCOUNT_RESERVE;
+}
+
static inline int page_has_type(struct page *page)
{
- return (int)page->page_type < PAGE_MAPCOUNT_RESERVE;
+ return page_type_has_type(page->page_type);
}
#define PAGE_TYPE_OPS(uname, lname) \
__def_pageflag_names \
) : "none"
+#define DEF_PAGETYPE_NAME(_name) { PG_##_name, __stringify(_name) }
+
+#define __def_pagetype_names \
+ DEF_PAGETYPE_NAME(offline), \
+ DEF_PAGETYPE_NAME(guard), \
+ DEF_PAGETYPE_NAME(table), \
+ DEF_PAGETYPE_NAME(buddy)
+
#if defined(CONFIG_X86)
#define __VM_ARCH_SPECIFIC_1 {VM_PAT, "pat" }
#elif defined(CONFIG_PPC)
test(cmp_buf, "%pGp", &flags);
}
+static void __init page_type_test(unsigned int page_type, const char *name,
+ char *cmp_buf)
+{
+ unsigned long size;
+
+ size = scnprintf(cmp_buf, BUF_SIZE, "%#x(", page_type);
+ if (page_type_has_type(page_type))
+ size += scnprintf(cmp_buf + size, BUF_SIZE - size, "%s", name);
+
+ snprintf(cmp_buf + size, BUF_SIZE - size, ")");
+ test(cmp_buf, "%pGt", &page_type);
+}
+
static void __init
flags(void)
{
unsigned long flags;
char *cmp_buffer;
gfp_t gfp;
+ unsigned int page_type;
cmp_buffer = kmalloc(BUF_SIZE, GFP_KERNEL);
if (!cmp_buffer)
gfp |= __GFP_HIGH;
test(cmp_buffer, "%pGg", &gfp);
+ page_type = ~0;
+ page_type_test(page_type, "", cmp_buffer);
+
+ page_type = 10;
+ page_type_test(page_type, "", cmp_buffer);
+
+ page_type = ~PG_buddy;
+ page_type_test(page_type, "buddy", cmp_buffer);
+
+ page_type = ~(PG_table | PG_buddy);
+ page_type_test(page_type, "table|buddy", cmp_buffer);
+
kfree(cmp_buffer);
}
return buf;
}
+static
+char *format_page_type(char *buf, char *end, unsigned int page_type)
+{
+ buf = number(buf, end, page_type, default_flag_spec);
+
+ if (buf < end)
+ *buf = '(';
+ buf++;
+
+ if (page_type_has_type(page_type))
+ buf = format_flags(buf, end, ~page_type, pagetype_names);
+
+ if (buf < end)
+ *buf = ')';
+ buf++;
+
+ return buf;
+}
+
static noinline_for_stack
char *flags_string(char *buf, char *end, void *flags_ptr,
struct printf_spec spec, const char *fmt)
switch (fmt[1]) {
case 'p':
return format_page_flags(buf, end, *(unsigned long *)flags_ptr);
+ case 't':
+ return format_page_type(buf, end, *(unsigned int *)flags_ptr);
case 'v':
flags = *(unsigned long *)flags_ptr;
names = vmaflag_names;
{0, NULL}
};
+const struct trace_print_flags pagetype_names[] = {
+ __def_pagetype_names,
+ {0, NULL}
+};
+
const struct trace_print_flags gfpflag_names[] = {
__def_gfpflag_names,
{0, NULL}
#endif /* CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH */
extern const struct trace_print_flags pageflag_names[];
+extern const struct trace_print_flags pagetype_names[];
extern const struct trace_print_flags vmaflag_names[];
extern const struct trace_print_flags gfpflag_names[];
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