STRUCT TTM_BACKUP_FLAGS(9)

okay bestie, you’re looking at struct ttm_backup_flags(9) from the Kernel API Manual, and it’s giving tiny-but-mighty flag-struct energy ✨

🎀 NAME 🎀

struct ttm_backup_flags — Flags to govern backup behaviour.

✨ SYNOPSIS ✨

okay so this is the whole struct, no cap:

       struct ttm_backup_flags {
           u32 purge : 1;
           u32 writeback : 1;
        };

💅 Members 💅

these are the two fields inside it, and yes they’re both u32 bitfields with : 1:

• purge — Free pages without backing up. Bypass pools. 🫧 literally the “no backup, just free” option.
• writeback — Attempt to copy contents directly to swap space, even if that means blocking on writes to external memory. 😭 bestie, it said blocking, so it can wait on those external-memory writes.

no extra lore, that’s genuinely what the two flags say 💅

🔥 SEE ALSO 🔥

Kernel file: ./include/drm/ttm/ttm_tt.h — and the whole squad is:

• struct ttm_tt(9)
• struct ttm_kmap_iter_tt(9)
• ttm_tt_is_swapped(9)
• ttm_tt_is_backed_up(9)
• ttm_tt_clear_backed_up(9)
• ttm_tt_create(9)
• ttm_tt_init(9)
• ttm_tt_fini(9)
• ttm_tt_destroy(9)
• ttm_tt_swapin(9)
• ttm_tt_populate(9)
• ttm_tt_unpopulate(9)
• ttm_tt_mark_for_clear(9)
• ttm_agp_tt_create(9)

xoxo from source/version ./include/drm/ttm, dated October 2026, all about struct ttm_backup_flags(9) 💖🦋