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authorNhat Pham <[email protected]>2023-10-20 15:20:09 -0700
committerAndrew Morton <[email protected]>2023-11-01 12:38:35 -0700
commit6479b29203dedb724f4f4e08e1cc0dcf432c333b (patch)
tree427917074c65fc0b86b793f688f614928c95e240 /tools/perf/util/trace-event-scripting.c
parent9e1b016a0bc97112a18427bce1b6849d28c6eb91 (diff)
selftests: add a sanity check for zswap
We recently encountered a bug that makes all zswap store attempt fail. Specifically, after: "141fdeececb3 mm/zswap: delay the initialization of zswap" if we build a kernel with zswap disabled by default, then enabled after the swapfile is set up, the zswap tree will not be initialized. As a result, all zswap store calls will be short-circuited. We have to perform another swapon to get zswap working properly again. Fortunately, this issue has since been fixed by the patch that kills frontswap: "42c06a0e8ebe mm: kill frontswap" which performs zswap_swapon() unconditionally, i.e always initializing the zswap tree. This test add a sanity check that ensure zswap storing works as intended. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Nhat Pham <[email protected]> Acked-by: Rik van Riel <[email protected]> Cc: Domenico Cerasuolo <[email protected]> Cc: Johannes Weiner <[email protected]> Cc: Shuah Khan <[email protected]> Cc: Tejun Heo <[email protected]> Cc: Zefan Li <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
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