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c8zMabEocN/hqnTeOF74Oi3sq5VehShJ6owJqHKNPEIRGPjweetz/HvjBUKt9eQafA+bRMmZIGI91r4YY2KSrUUTMbw/hNLNeRwFOb5BVGuaAczzRxAjYlybPPdM6xXRHAKz71d5QvPHJi1wB+aT/aPocLGTkGFHk6Kr6bGlhXCMBno6PlgCjy2rlp/5GTIp1SCV/4xiJQjxg4JQNshtpXYFBxUH8h1/P5aPA8jjheD0rIHaqbMMiw8As4iTFyHTacnVIYkBe9Wl+KjLnOu+HKM1Jn4fjVDZd3K+ug9HYTa9w2q8Z2hQq+6UGca4r2XhoKsSmaa5gI97plfNT347+3xD7Kq6WqT6re74p/yQrtlmhLqseVhpRQ2YLy2nRr6ze7ZkduCmo/z/ZdXMrn9Xqlim94sOQ2Qwzqi4rw8mlaUKW/34DPpw9LW60CaTRb+nXuV+WBNDZTz7tDr6WyTNrJDsV6w== Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 19 Apr 2026, at 11:55, Zhen Ni wrote: > Add print_mode functionality to reduce page_owner output size by > printing only the stack handle instead of the full stack trace. > > Example output with print_mode enabled: > 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=3D3|zone=3D= 0| > lastcpupid=3D0x1ffff) > handle: 17432583 > Charged to memcg / > > Print mode significantly reduces output size while preserving all > other page allocation information. The correspondence between handles > and stack traces can be obtained through the show_stacks_handles interfac= e. > > Link: https://lore.kernel.org/linux-mm/20260417154638.22370-3-zhen.ni@eas= ystack.cn/ > Suggested-by: Zi Yan > Signed-off-by: Zhen Ni > --- > > Changes in v2: > - Renamed from 'compact mode' to 'print_mode' for better clarity > - Use enum values (0=3Dfull_stack, 1=3Dstack_handle) instead of boolean > - Update debugfs filename from 'compact' to 'print_mode' > --- > mm/page_owner.c | 28 +++++++++++++++++++++++++++- > 1 file changed, 27 insertions(+), 1 deletion(-) > > diff --git a/mm/page_owner.c b/mm/page_owner.c > index 5884d883837e..6d87b6948cfa 100644 > --- a/mm/page_owner.c > +++ b/mm/page_owner.c > @@ -590,7 +590,13 @@ print_page_owner(char __user *buf, size_t count, uns= igned long pfn, > migratetype_names[pageblock_mt], > &page->flags); > > - ret +=3D stack_depot_snprint(handle, kbuf + ret, count - ret, 0); > + /* Print mode: full stack or stack handle */ > + if (READ_ONCE(owner_filter.print_mode) =3D=3D PAGE_OWNER_PRINT_STACK_HA= NDLE) { > + ret +=3D scnprintf(kbuf + ret, count - ret, > + "handle: %d\n", handle); > + } else { > + ret +=3D stack_depot_snprint(handle, kbuf + ret, count - ret, 0); > + } > if (ret >=3D count) > goto err; > > @@ -985,6 +991,24 @@ 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_print_mode_get(void *data, u64 *val) > +{ > + *val =3D READ_ONCE(owner_filter.print_mode); > + return 0; > +} > + > +static int page_owner_print_mode_set(void *data, u64 val) > +{ > + if (val > PAGE_OWNER_PRINT_STACK_HANDLE) > + return -EINVAL; > + WRITE_ONCE(owner_filter.print_mode, val); > + return 0; > +} > + > +DEFINE_SIMPLE_ATTRIBUTE(page_owner_print_mode_fops, > + &page_owner_print_mode_get, > + &page_owner_print_mode_set, "%lld"); > + > > static int __init pageowner_init(void) > { > @@ -998,6 +1022,8 @@ static int __init pageowner_init(void) > debugfs_create_file("page_owner", 0400, NULL, NULL, &page_owner_fops); > > filter_dir =3D debugfs_create_dir("page_owner_filter", NULL); > + debugfs_create_file("print_mode", 0600, filter_dir, NULL, > + &page_owner_print_mode_fops); > > dir =3D debugfs_create_dir("page_owner_stacks", NULL); > debugfs_create_file("show_stacks", 0400, dir, > --=20 > 2.20.1 I think it is more user-friendly to use =E2=80=9Cfull_stack=E2=80=9D and = =E2=80=9Cstack_handle=E2=80=9D instead of 0 and 1. You can refer to [1] to sysfs_match_string() to do that. I was testing the interface, but needed to look at your code to know which print_mode I am using. ;) [1] https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git/tree/mm/hug= e_memory.c?h=3Dmm-everything#n380 Best Regards, Yan, Zi