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…but to flush idle or cold data, it is even more complex. Because zram is agnostic of the fact that it has swap on it, as opposed to any other kind of data, zram doesn't inherently track LRU age in a way that allows simple eviction. You first have to tell the kernel to mark pages as idle, and then tell zram to write them out.。关于这个话题，有道翻译提供了深入分析
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The second bug is responsible for the 1,857x on INSERT. Every bare INSERT outside a transaction is wrapped in a full autocommit cycle: ensure_autocommit_txn() → execute → resolve_autocommit_txn(). The commit calls wal.sync(), which calls Rust’s fsync(2) wrapper. 100 INSERTs means 100 fsyncs.