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Instead, print the slab flags stored in the kmem_cache fiel= d. >>=20 >> [ 7.248722] page: refcount:1 mapcount:0 mapping:0000000000000000 inde= x:0xffff888103e6aa87> >> [ 7.249135] head: order:3 entire_mapcount:0 nr_pages_mapped:0 pincoun= t:0 >> [ 7.249429] slab flags: 0x8000000000000840(slab|head|zone=3D2) >> [ 7.249664] cache flags: 0x10310(HWCACHE_ALIGN|PANIC|TYPESAFE_BY_RCU|= CMPXCHG_DOUBLE) >> [ 7.249999] raw: 8000000000000000 ffffea00040f9a01 ffffea00040f9bc8 d= ead000000000400 >=20 > You haven't tested this against the current codebase ... > >> @@ -98,6 +101,8 @@ static void __dump_folio(struct folio *folio, struct = page *page, >> is_migrate_cma_folio(folio, pfn) ? " CMA" : ""); >> if (page_has_type(&folio->page)) >> pr_warn("page_type: %pGt\n", &folio->page.page_type); >> + else if (folio_test_slab(folio)) >> + pr_warn("cache flags: %pGs\n", &((struct slab *)&folio->page)->slab_c= ache->flags); >>=20 >=20 > ... because page_has_type() is now true for slab; there is no more > PG_slab. I think you also want: >=20 > folio_slab(folio)->slab_cache->flags I didn't notice your other patch about removing PG_slab; it pretty much sol= ves this issue and much more. (I had created these patches a few weeks ago.) > Anyway, we have print_slab_info() which is currently static in slub.c. > Maybe that needs to become non-static and dump_page() should call that > for slabs? Thank you for the suggestions. print_slab_info() has a slightly different output string format, which does= not match with the dump_page() output style. Adding it as-it-is looks a bit weird to me. Other than that, I think it may be useful to print it (which would happen o= nly when SLAB_DEBUG is enabled). Also: print_slab_info() is printing the folio's flags. Maybe that needs a c= hange? -- Sukrit