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9IMNVQmvHJXTfmf7vQKsZ3EMgjMbDUgOiDcxZ448skmjmn+dwYsSw3HOBQJVX3R3a0g0ZufadNE+2AmnHmGKw6+lQUP2bAcKLYV9kXl9b4CVX5HCnBcnoFMq5KpIG+u1MwlmM9quvEz/FeB1g5zmKRe+Os391RnCVPgUE7SjvLreCLZAcnSYJridW+aOBBkFySvyIk9vhRc9gj5SqMtK9XkyWvw0KBfqCpBT2hiCKWWpVDGduqaTyE7TUOfx6z6C6qb3pE2bc4TqhIiuJfJKp8GBVrMJyt25DgBjRxz+b18eH+JDEySOrEauT54WdyTRCvlUqxNEnx8rloQMiSnPfFCt8SfQna7j+R2aTmJO/si/M+EZ5pVUsG5VeQLAYfKYpLJMFzBfxcHOUfGQ8NonUG3z5DTaScaVmaTRWjV1ypWjKtJj7ogr/hqTsiTRu94kHplpqvFVQKHtq7lzbgBttFeRBjbmKAyI28fY5 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: From: Xueyuan Chen zs_shrinker_scan() currently calls zs_compact(), which compacts the whole pool regardless of sc->nr_to_scan. A single shrinker callback can therefore reclaim much more than requested and spend a long time in compaction. On an Android device with 12 GB of RAM, observed zsmalloc compaction durations had a p95 of 38.86 ms and a maximum of 269.68 ms, motivating a per-scan reclaim goal. This series uses sc->nr_to_scan as a reclaimed-page goal and keeps a per-pool size-class cursor so later scans resume where the previous scan stopped. The existing full-pool behavior of zs_compact() is unchanged. Xueyuan Chen (2): mm: zsmalloc: add a page limit to pool compaction mm: zsmalloc: use the shrinker reclaim budget mm/zsmalloc.c | 46 +++++++++++++++++++++++++++++++--------------- 1 file changed, 31 insertions(+), 15 deletions(-) -- 2.47.3