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Wed, 25 Mar 2026 23:27:12 -0400 X-MC-Unique: ntm5MVGbMGCvlJZ59BK7TQ-1 X-Mimecast-MFC-AGG-ID: ntm5MVGbMGCvlJZ59BK7TQ_1774495630 Received: from mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com [10.30.177.17]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by mx-prod-mc-03.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 095051944F05; Thu, 26 Mar 2026 03:27:10 +0000 (UTC) Received: from fedora-laptop-x1.redhat.com (unknown [10.72.112.83]) by mx-prod-int-05.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTPS id 21DCB1955D84; Thu, 26 Mar 2026 03:27:02 +0000 (UTC) From: Li Wang To: akpm@linux-foundation.org, yosry@kernel.org, nphamcs@gmail.com, hannes@cmpxchg.org, mhocko@kernel.org, mkoutny@suse.com, muchun.song@linux.dev, tj@kernel.org, roman.gushchin@linux.dev, shakeel.butt@linux.dev Cc: longman@redhat.com, liwang@redhat.com, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org, linux-mm@kvack.org Subject: [PATCH v5 0/8] selftests/cgroup: improve zswap tests robustness and support large page sizes Date: Thu, 26 Mar 2026 11:26:50 +0800 Message-ID: <20260326032658.96819-1-liwang@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.17 X-Mimecast-MFC-PROC-ID: lcIiRhayOoCatGoH7o6CxL6mUhH9JfTFiddbD3GLJ3w_1774495630 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit X-Rspamd-Queue-Id: B6393180002 X-Stat-Signature: p6xc4igssuu1uot9dkjrt65ts7ebw3st X-Rspam-User: X-Rspamd-Server: rspam08 X-HE-Tag: 1774495636-517353 X-HE-Meta: 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 tERmAKCu jvBAJcEj4AEnT50rIyvm7pjHe2ly/5rCcNNnfXnbitbXVMRmgXg3ujv1vwthHakZoqe9F3FfjEQUl+1v010g/iZMNXq0dj0lHlx5BPZ3LhR24KSOTC1UzlKb6yVD0rtoqWse6kKYR/TGaCSyE67YmC44z7gORxrNoQQ7/tHllI02mJwgnHMJrhZ6BYWraY/jdk1mmRG9jVDaeoeZy78oE0IxL9/NlNfRSPlxf+aAdmO1INqHijkXHenhrMDegY8llF7xa8PruOfypbI7qfnwBq1avozvsKJdojkRZKp7t+O3VCmnu43GsTjTrc2l/A35Y2Cic Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: This patchset aims to fix various spurious failures and improve the overall robustness of the cgroup zswap selftests. The primary motivation is to make the tests compatible with architectures that use non-4K page sizes (such as 64K on ppc64le and arm64). Currently, the tests rely heavily on hardcoded 4K page sizes and fixed memory limits. On 64K page size systems, these hardcoded values lead to sub-page granularity accesses, incorrect page count calculations, and insufficient memory pressure to trigger zswap writeback, ultimately causing the tests to fail. Additionally, this series addresses OOM kills occurring in test_swapin_nozswap by dynamically scaling memory limits, and prevents spurious test failures when zswap is built into the kernel but globally disabled. Changes in v5: Patch 1/8: Defined PATH_ZSWAP and PATH_ZSWAP_ENABLED macros. Patch 4/8: Merge Waiman's work into this patch (use page_size). Patch 5/8: Change pagesize by the global page_size. Patch 6/8: Swap data patterns: use getrandom() for wb_group and simple memset for zw_group to fix the reversed allocation logic. Patch 7/8: Setting zswap.max to zswap_usage/4 to increase writeback pressure. Patch 8/8: New added. Just add loops for read zswpwb more times. Test all passed on: x86_64(4k), aarch64(4K, 64K), ppc64le(64K). Li Wang (8): selftests/cgroup: skip test_zswap if zswap is globally disabled selftests/cgroup: avoid OOM in test_swapin_nozswap selftests/cgroup: use runtime page size for zswpin check selftests/cgroup: rename PAGE_SIZE to BUF_SIZE in cgroup_util selftests/cgroup: replace hardcoded page size values in test_zswap selftest/cgroup: fix zswap test_no_invasive_cgroup_shrink on large pagesize system selftest/cgroup: fix zswap attempt_writeback() on 64K pagesize system selftests/cgroup: test_zswap: wait for asynchronous writeback .../selftests/cgroup/lib/cgroup_util.c | 18 +- .../cgroup/lib/include/cgroup_util.h | 4 +- tools/testing/selftests/cgroup/test_core.c | 2 +- tools/testing/selftests/cgroup/test_freezer.c | 2 +- .../selftests/cgroup/test_memcontrol.c | 19 +- tools/testing/selftests/cgroup/test_zswap.c | 174 +++++++++++++----- 6 files changed, 148 insertions(+), 71 deletions(-) -- 2.53.0