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SubjectRe: [RFC PATCH] mm: reduce noise in show_mem for lowmem allocations
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On 8/23/22 11:22, Michal Hocko wrote:
> All but node0 are really completely irrelevant for this allocation
> because they do not have ZONE_DMA yet it swamps the log and makes it
> harder to visually inspect.
>
> Address this by providing gfp_maks parameter to show_mem and filter the
> output to only those zones/nodes which are relevant for the allocation.
> That means nodes which have at least one managed zone which is usable
> for the allocation (zone_idx(zone) <= gfp_zone(gfp_mask)).
> The resulting output for the same failure would become:

Looks good to me.

> [...]
> [ 14.017605][ T1] Mem-Info:

Maybe print the gfp_mask (or just max zone) here again, to make it more
obvious in case somebody sents a report without the top header?

> [ 14.017956][ T1] active_anon:0 inactive_anon:0 isolated_anon:0
> [ 14.017956][ T1] active_file:0 inactive_file:0 isolated_file:0
> [ 14.017956][ T1] unevictable:0 dirty:0 writeback:0
> [ 14.017956][ T1] slab_reclaimable:876 slab_unreclaimable:30300
> [ 14.017956][ T1] mapped:0 shmem:0 pagetables:12 bounce:0
> [ 14.017956][ T1] free:3170151735 free_pcp:6868 free_cma:0
> [ 14.017962][ T1] Node 0 active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB isolated(anon):0kB isolated(file):0kB mapped:0kB dirty:0kB writeback:0kB shmem:0kB shmem_thp: 0kB shmem_pmdmapped: 0kB anon_thp: 0kB writeback_tmp:0kB kernel_stack:7200kB pagetables:4kB all_unreclaimable? no
> [ 14.018026][ T1] Node 0 DMA free:160kB boost:0kB min:0kB low:0kB high:0kB reserved_highatomic:0KB active_anon:0kB inactive_anon:0kB active_file:0kB inactive_file:0kB unevictable:0kB writepending:0kB present:15996kB managed:15360kB mlocked:0kB bounce:0kB free_pcp:0kB local_pcp:0kB free_cma:0kB
> [ 14.018035][ T1] lowmem_reserve[]: 0 0 0 0 0
> [ 14.018339][ T1] Node 0 DMA: 0*4kB 0*8kB 0*16kB 1*32kB (U) 0*64kB 1*128kB (U) 0*256kB 0*512kB 0*1024kB 0*2048kB 0*4096kB = 160kB
> [ 14.018480][ T1] 0 total pagecache pages
> [ 14.018483][ T1] 0 pages in swap cache
> [ 14.018484][ T1] Swap cache stats: add 0, delete 0, find 0/0
> [ 14.018486][ T1] Free swap = 0kB
> [ 14.018487][ T1] Total swap = 0kB
> [ 14.018488][ T1] 3221164600 pages RAM
> [ 14.018489][ T1] 0 pages HighMem/MovableOnly
> [ 14.018490][ T1] 50531051 pages reserved
> [ 14.018491][ T1] 0 pages cma reserved
> [ 14.018492][ T1] 0 pages hwpoisoned
>
> Signed-off-by: Michal Hocko <mhocko@suse.com>

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