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alfalfa-starandClaude Opus 5.5
4f9ddffce0
#2096 keeps a copy of a storage image's guest bytes so that Refresh can compare memory the write watch does not cover. The host-import upload path takes that copy only when the range is unwatched, but the DCC fast-clear path took it on every upload. Reading the whole surface goes through the flush hook, so each 64 KiB block of a surface that a unit shadow covers recorded a publish and waited for the GPU. The clear path now resolves the surface's host import first (the import can unwatch the range, as a compared host-pointer import does) and takes the copy only when the range is then unwatched, like the import path. Write-watched memory, such as direct memory behind a dma-buf import, skips it; a range that is unwatched later re-uploads instead of comparing, as before #2096. agc_driver_dcc_keys_first_write checks that a fast-cleared upload keeps the copy exactly when its range is unwatched at that point. PPSA14632 (LEGO Horizon Adventures) on Linux, RX 9070 XT: the flush hook waited ~60,000 times per 10 s for these publishes (6.4 s), now ~3,500, and presents rise from ~24 to ~100 per 10 s. Co-Authored-By: Claude Opus 5.5 <[email protected]>