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QDTIZj+ZrnvCS+lCWwBLXTkj5wXBiQpl8BrLaL4d4nyya/wWuAOLCWBkPgHMG+o2d7VRMxqvEmeMcbJiHct4Veu1jJ0DBaag7jfadM1u0UjqtxMluSNF5jFTriBO0yh15fxN3FaEEIWEAN8MN7h4ZaqXpfg7auemPmZlvrB3kSuxdm22waP4AKjE0azQIkmn01wvzmhB5YTjhggweuLrwCoyExfcKGW6d8nEQzW6BvgfMpUaRFZu9uy0xTN2tUu1klccMAgcjQ7v4LBvrdcQSJ5MIl+fRqwbqsqGm71ovDDug1+u7fIKNhwZaBj8uOQtWbgkIqedVBAkZafmjI7z626d3B3nNW+mH1miJiquLQeXtIb5oZ+BIMrHcKqo4gaIDeQ4HpzBAmaDR7WJeua1onTZ88Hy0lMSBmzV2QAx1JBePiIPSn/V7euMUjApnUqD3yJDUTcVz/PgyX74= X-Bogosity: Ham, tests=bogofilter, spamicity=0.000000, version=1.2.4 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On 11/10/2025 7:58 PM, Matthew Wilcox wrote: > On Mon, Nov 10, 2025 at 07:50:17PM +0530, Garg, Shivank wrote: >> The issue is copying those binary to a freshly mounted filesystem. >> The page cache folios remain dirty until background writeback completes. >> >> Reproduces 100% for me: fresh XFS/EXT4 mount -> copy binary -> execute -> MADV_COLLAPSE fails. > > Yes, but this is an uncommon thing to do. Really, it's the kind of > thing you do when you're testing something (like, whether ext4 supports > large folios, and whether that yields a performance improvement). > It's more reasonable to change userspace than the kernel to solve this > problem you're having. Fair point. You're right that this is primarily a testing scenario, though it may also potentially affect JIT compilers writing executables (also uncommon) but more research is needed. For userspace workarounds, calling fsync() before MADV_COLLAPSE works. Synchronous writeback in MADV_COLLAPSE seems reasonable given it's already a blocking operation. Alternatively, dropping this patch and keeping only patch 2 also works for me. As for user sanity, returning -EAGAIN instead of -EINVAL and some documentation would be beneficial. Happy to go with whichever approach you think is most appropriate. Thanks, Shivank