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Maybe you could add an enum type for what content is printed. Something like PAGE_OWNER_PRINT_STACK_HANDLE and PAGE_OWNER_PRINT_FULL_STACK. Since compact is a very vague name for what the code does. For the sysfs interface, stack_handle vs full_stack would be used. > > Example output: > Page allocated via order 0, mask 0x42800(GFP_NOWAIT|__GFP_COMP), > pid 1, tgid 1 (systemd), ts 349667370 ns > PFN 0xa00a2 type Unmovable Block 1280 type Unmovable > Flags 0x33fffe0000004124(referenced|lru|active|private|node=3|zone=0| > lastcpupid=0x1ffff) > handle: 17432583 > Charged to memcg / > > Compact mode significantly reduces output size while preserving all > other page allocation information, making it easier to analyze large > volumes of page owner data.The correspondence between handles and stack > traces can be obtained through the show_stacks_handles interface. > > Signed-off-by: Zhen Ni > --- > mm/page_owner.c | 29 ++++++++++++++++++++++++++++- > 1 file changed, 28 insertions(+), 1 deletion(-) > > diff --git a/mm/page_owner.c b/mm/page_owner.c > index 6811439bf9e4..214b58eef3d8 100644 > --- a/mm/page_owner.c > +++ b/mm/page_owner.c > @@ -585,7 +585,14 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn, > migratetype_names[pageblock_mt], > &page->flags); > > - ret += stack_depot_snprint(handle, kbuf + ret, count - ret, 0); > + /* Compact mode: print handle instead of full stack trace */ > + if (READ_ONCE(owner_filter.compact)) { > + ret += scnprintf(kbuf + ret, count - ret, > + "handle: %d\n", handle); > + } else { > + ret += stack_depot_snprint(handle, kbuf + ret, count - ret, 0); > + } > + > if (ret >= count) > goto err; > > @@ -980,6 +987,24 @@ static int page_owner_threshold_set(void *data, u64 val) > DEFINE_SIMPLE_ATTRIBUTE(page_owner_threshold_fops, &page_owner_threshold_get, > &page_owner_threshold_set, "%llu"); > > +static int page_owner_compact_get(void *data, u64 *val) > +{ > + *val = READ_ONCE(owner_filter.compact); > + return 0; > +} > + > +static int page_owner_compact_set(void *data, u64 val) > +{ > + if (val != 0 && val != 1) > + return -EINVAL; > + WRITE_ONCE(owner_filter.compact, val); > + return 0; > +} > + > +DEFINE_SIMPLE_ATTRIBUTE(page_owner_compact_fops, > + &page_owner_compact_get, > + &page_owner_compact_set, "%lld"); > + > > static int __init pageowner_init(void) > { > @@ -993,6 +1018,8 @@ static int __init pageowner_init(void) > debugfs_create_file("page_owner", 0400, NULL, NULL, &page_owner_fops); > > filter_dir = debugfs_create_dir("page_owner_filter", NULL); > + debugfs_create_file("compact", 0600, filter_dir, NULL, > + &page_owner_compact_fops); > > dir = debugfs_create_dir("page_owner_stacks", NULL); > debugfs_create_file("show_stacks", 0400, dir, > -- > 2.20.1 Best Regards, Yan, Zi