test(lmbench): 引入 lmbench 测试框架集成和自动测试脚本 - #1433
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- 从 DragonOS 镜像站安装 lmbench 二进制包 - 添加 lmbench 测试用例脚本，涵盖内存、进程、文件系统和网络等方面的性能测试 - 修改使用 ext2 文件系统的测试脚本为使用 ext4 文件系统 - 添加测试环境初始化脚本 init.sh ，清理脚本 clean_up.sh和环境变量配置脚本 env.sh
- 修复 `lmbench/mem_map_lat` 测例的权限问题，确保测试能够正确执行。 - 在 `ramfs_copy_files_bw` 测试中添加 `sudo`，以确保有足够的权限进行文件操作。 - 修复 `vfs_xx_lat` 系列测试缺少临时文件的问题，确保测试环境完整。
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…(container-confirmed)
…NER hang lmbench's BENCH_INNER macro (bench.h) loops `while(__result < 0.95 * get_enough(0))`. Under virtualized timing compute_enough() can return SHORT=1000000, making __iterations explode (<<=3 past the 1<<27 break that resets __result=0) into an infinite while — the observed benchmp hangs on WSL2 (lat_fifo/bw_unix/lat_sem/bw_tcp/lat_select tcp/lat_udp/ lat_unix_connect all busy-loop state=R until timeout). Fix: precompute ENOUGH once via lmbench's `enough` tool (the standard config-run flow: `ENOUGH=`../bin/$OS/enough``), then clamp to <=100000 so BENCH_INNER's inner calibration converges, with 50000 (REAL_SHORT) fallback on hang/failure. Enough<=100000 makes the while(__result < 0.95*enough) target small enough to converge under timing jitter. Root cause confirmed via systematic-debugging on host: ENOUGH<=100000 unblocks all hung tools (lat_pipe/lat_unix/lat_sem/bw_unix output normal), ENOUGH=1000000 hangs, TIMING_O=0 LOOP_O=0 unblocks (skips BENCH_INNER). Not a DragonOS kernel issue; guest 8/8 e2e implies guest timing is stable.
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