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b=h3Twi9g569dZT07Ied/Me3zb+JPHA6eAsaQsNpHFXJrsrM4zUZlehSAh2LWT0VN/4 qKd3Usi/c2Y7+LBaDAlN7ZMeW3J/2WG2cgGiEo1CkFwqRMSAowxutZvnGNxVteJQA3 31c//zfVgdvryiRcUuP4ITuW/prdCVrvtsJdZkf4= Date: Fri, 24 Apr 2026 03:06:05 -0700 From: Andrew Morton To: Li Wang Cc: tj@kernel.org, longman@redhat.com, roman.gushchin@linux.dev, hannes@cmpxchg.org, yosry@kernel.org, jiayuan.chen@linux.dev, nphamcs@gmail.com, chengming.zhou@linux.dev, mkoutny@suse.com, shuah@kernel.org, linux-mm@kvack.org, cgroups@vger.kernel.org, linux-kselftest@vger.kernel.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v7 0/8] selftests/cgroup: improve zswap tests robustness and support large page sizes Message-Id: <20260424030605.6d0053c0df14bba325114e1b@linux-foundation.org> In-Reply-To: <20260424040059.12940-1-li.wang@linux.dev> References: <20260424040059.12940-1-li.wang@linux.dev> X-Mailer: Sylpheed 3.8.0beta1 (GTK+ 2.24.33; x86_64-pc-linux-gnu) Mime-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit X-Rspamd-Queue-Id: 56DF8120013 X-Rspamd-Server: rspam07 X-Stat-Signature: 1cgfbqewy5fb88mz1p44fcjnu86qk4q3 X-Rspam-User: X-HE-Tag: 1777025167-902473 X-HE-Meta: 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 GfcCPsLa ySp/GeixXdLpwFfvoTZUOalmXy70KcULMIG6KEh4QV6lZXGoptf57lePe0FwSoi9Dr0znujsxIX0CdCkREu1PDXSH0yccB1DNuaQmVZ+lDm+ohkGjhOhSqp92kVNLxZRjzrkajTXaumTKi7wCBZZ8BP+yfHsOdJoJgYhIMz++yESwc6bLzwg00vUFixZb/PkZBGWCUhUkP6nE0FTC6fFRh5U9P0gvBVXpwU7jhT+FUu+k5ZqVvM7jg7hvb1YVysOTMxR0 Sender: owner-linux-mm@kvack.org Precedence: bulk X-Loop: owner-majordomo@kvack.org List-ID: List-Subscribe: List-Unsubscribe: On Fri, 24 Apr 2026 12:00:51 +0800 Li Wang wrote: > This patchset aims to fix various spurious failures and improve the overall > robustness of the cgroup zswap selftests. Great, thanks, I'll queue this in mm.git's mm-new branch. Next week I'll move it into mm-unstable, where it will receive liunx-next exposure. > 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. Well that's an oops. > 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. I assume you've been testing on arm64 or ppc? > 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.