From: Andrew Morton <akpm@linux-foundation.org>
To: wangjianxing <wangjianxing@loongson.cn>
Cc: Matthew Wilcox <willy@infradead.org>,
linux-mm@kvack.org, linux-kernel@vger.kernel.org, vbabka@suse.cz
Subject: Re: [PATCH 1/1] mm/page_alloc: add scheduling point to free_unref_page_list
Date: Wed, 9 Mar 2022 19:29:47 -0800 [thread overview]
Message-ID: <20220309192947.0b4c8c875c492de09c1ab632@linux-foundation.org> (raw)
In-Reply-To: <3713cb82-9596-9916-9830-c2827d6a6fe4@loongson.cn>
On Thu, 10 Mar 2022 10:48:41 +0800 wangjianxing <wangjianxing@loongson.cn> wrote:
> spin_lock will preempt_disable(), interrupt context will
> __irq_enter/local_bh_disable and also add preempt count with offset.
>
> cond_resched check whether if preempt_count == 0 in first and won't
> schedule in previous context.
>
> Is this right?
>
>
> With another way, could we add some condition to avoid call cond_resched
> in interrupt context or spin_lock()?
>
> + if (preemptible())
> + cond_resched();
>
None of this works with CONFIG_PREEMPTION=n.
next prev parent reply other threads:[~2022-03-10 3:29 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-03-02 1:38 wangjianxing
2022-03-02 23:34 ` Andrew Morton
2022-03-03 2:02 ` wangjianxing
2022-03-08 16:04 ` Vlastimil Babka
2022-03-08 16:05 ` Vlastimil Babka
2022-03-08 16:19 ` Matthew Wilcox
2022-03-10 1:05 ` Andrew Morton
2022-03-10 2:48 ` wangjianxing
2022-03-10 3:29 ` Andrew Morton [this message]
2022-03-10 9:11 ` Vlastimil Babka
2022-03-11 3:22 ` wangjianxing
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