From: Guopeng Zhang <guopeng.zhang@linux.dev>
To: Johannes Weiner <hannes@cmpxchg.org>,
Suren Baghdasaryan <surenb@google.com>,
Peter Zijlstra <peterz@infradead.org>
Cc: Ingo Molnar <mingo@redhat.com>,
Juri Lelli <juri.lelli@redhat.com>,
Vincent Guittot <vincent.guittot@linaro.org>,
Dietmar Eggemann <dietmar.eggemann@arm.com>,
Steven Rostedt <rostedt@goodmis.org>,
Ben Segall <bsegall@google.com>, Mel Gorman <mgorman@suse.de>,
Valentin Schneider <vschneid@redhat.com>,
K Prateek Nayak <kprateek.nayak@amd.com>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org
Subject: [PATCH 0/2] sched/psi: Fix trigger time arithmetic
Date: Fri, 17 Jul 2026 18:28:22 +0800 [thread overview]
Message-ID: <20260717102824.985950-1-guopeng.zhang@linux.dev> (raw)
From: Guopeng Zhang <zhangguopeng@kylinos.cn>
PSI trigger time handling has two integer-width bugs. Long windows can
be truncated during growth interpolation, and the multiplication used
for the interpolation can overflow before the division. Separately,
the microsecond-to-nanosecond conversion can wrap on 32-bit systems
before the result is stored in a u64.
Fix the two issues independently.
Guopeng Zhang (2):
sched/psi: Fix long-window growth interpolation
sched/psi: Fix overflow in trigger time conversion on 32-bit
kernel/sched/psi.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
base-commit: 1a1757b76427f6201bfe0bf1bea9f7574f332a93
--
2.43.0
next reply other threads:[~2026-07-17 10:28 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2026-07-17 10:28 Guopeng Zhang [this message]
2026-07-17 10:28 ` [PATCH 1/2] sched/psi: Fix long-window growth interpolation Guopeng Zhang
2026-07-17 10:28 ` [PATCH 2/2] sched/psi: Fix overflow in trigger time conversion on 32-bit Guopeng Zhang
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