From: Cyril Hrubis <chrubis@suse.cz>
To: Changwei Zou <changwei.zou@canonical.com>
Cc: ltp@lists.linux.it
Subject: Re: [LTP] [PATCH v6] cpuset_memory_spread: count only the test file's page cache
Date: Mon, 2 Nov 2026 13:00:22 +0100 [thread overview]
Message-ID: <auh7VnkZqhAHbmIC@yuki.lan> (raw)
In-Reply-To: <20260905125041.27985-1-changwei.zou@canonical.com>
Hi!
> Instead of measuring the noisy global counters, account for only DATAFILE's
> own page-cache pages: after reading the file, cpuset_mem_hog mmaps it,
> faults every page in and uses move_pages(2) (with a NULL node array, so
> nothing is migrated) to learn the NUMA node each of the file's pages
> resides on. Every page must be accounted -- a per-page error (negative
> status) fails the run -- so a partial measurement cannot pass. It writes
> the per-node totals (in KB) to a result file that the shell reads.
This is a step into right direction, however before that is done, the
old and messy tests should be rewritten into a single C test that uses
the LTP cgroup library, see include/tst_cgroup.h
--
Cyril Hrubis
chrubis@suse.cz
--
Mailing list info: https://lists.linux.it/listinfo/ltp
prev parent reply other threads:[~2026-11-02 12:00 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-09-05 12:50 [LTP] [PATCH v6] cpuset_memory_spread: count only the test file's page cache Changwei Zou via ltp
2026-09-05 15:50 ` [LTP] " linuxtestproject.agent
2026-11-02 12:00 ` Cyril Hrubis [this message]
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