From: Davidlohr Bueso <dave@stgolabs.net>
To: Andi Kleen <ak@linux.intel.com>
Cc: Mike Kravetz <mike.kravetz@oracle.com>,
Waiman Long <longman@redhat.com>,
Matthew Wilcox <willy@infradead.org>,
Andrew Morton <akpm@linux-foundation.org>,
linux-kernel@vger.kernel.org, linux-mm@kvack.org,
Michal Hocko <mhocko@kernel.org>
Subject: Re: [PATCH v2] hugetlbfs: Disable softIRQ when taking hugetlb_lock
Date: Thu, 12 Dec 2019 14:42:44 -0800 [thread overview]
Message-ID: <20191212224244.ohfcrvnuc7euzmzw@linux-p48b> (raw)
In-Reply-To: <871rt99qmg.fsf@linux.intel.com>
On Thu, 12 Dec 2019, Andi Kleen wrote:
>Davidlohr Bueso <dave@stgolabs.net> writes:
>> +void free_huge_page(struct page *page)
>> +{
>> + struct hugetlb_free_page_work work;
>> +
>> + work.page = page;
>> + INIT_WORK_ONSTACK(&work.work, free_huge_page_workfn);
>> + queue_work(hugetlb_free_page_wq, &work.work);
>> +
>> + /*
>> + * Wait until free_huge_page is done.
>> + */
>> + flush_work(&work.work);
>> + destroy_work_on_stack(&work.work);
>
>Does flushing really work in softirq context?
>
>Anyways, waiting seems inefficient over fire'n'forget
Yep. I was only thinking about the workerfn not blocking
and therefore we could wait safely, but flush_work has no
such guarantees.
Thanks,
Davidlohr
next prev parent reply other threads:[~2019-12-12 22:49 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-11 19:46 [PATCH v2] hugetlbfs: Disable softIRQ when taking hugetlb_lock Waiman Long
2019-12-11 22:04 ` Mike Kravetz
2019-12-11 22:19 ` Waiman Long
2019-12-12 1:11 ` Mike Kravetz
2019-12-12 6:06 ` Davidlohr Bueso
2019-12-12 6:30 ` Davidlohr Bueso
2019-12-12 19:04 ` [PATCH v2] mm/hugetlb: defer free_huge_page() to a workqueue Davidlohr Bueso
2019-12-12 19:22 ` Mike Kravetz
2019-12-12 19:36 ` Davidlohr Bueso
2019-12-12 20:52 ` Waiman Long
2019-12-12 21:04 ` Waiman Long
2019-12-16 13:26 ` Michal Hocko
2019-12-16 15:38 ` Waiman Long
2019-12-16 18:44 ` Waiman Long
2019-12-17 9:00 ` Michal Hocko
2019-12-17 18:05 ` Mike Kravetz
2019-12-18 12:18 ` hugetlbfs testing coverage (was: Re: [PATCH v2] mm/hugetlb: defer free_huge_page() to a workqueue) Michal Hocko
2019-12-12 21:01 ` [PATCH v2] mm/hugetlb: defer free_huge_page() to a workqueue Waiman Long
2019-12-16 13:37 ` Michal Hocko
2019-12-16 16:17 ` Waiman Long
2019-12-16 16:17 ` Davidlohr Bueso
2019-12-16 17:18 ` Matthew Wilcox
2019-12-16 19:08 ` Mike Kravetz
2019-12-16 19:13 ` Waiman Long
2019-12-12 21:32 ` [PATCH v2] hugetlbfs: Disable softIRQ when taking hugetlb_lock Andi Kleen
2019-12-12 22:42 ` Davidlohr Bueso [this message]
2019-12-11 23:05 ` Andi Kleen
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