From: Christoph Hellwig <hch@lst.de>
To: Ming Lei <ming.lei@redhat.com>
Cc: Christoph Hellwig <hch@lst.de>, Jens Axboe <axboe@kernel.dk>,
linux-block@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 1/2] block: shutdown blktrace in case of fatal signal pending
Date: Tue, 6 Apr 2021 08:30:38 +0200 [thread overview]
Message-ID: <20210406063038.GA6337@lst.de> (raw)
In-Reply-To: <YGgi6FOr6cEiei+7@T590>
On Sat, Apr 03, 2021 at 04:10:16PM +0800, Ming Lei wrote:
> We still may shutdown blktrace if current is the last opener, otherwise
> new blktrace can't be started and memory should be leaked forever, and
> what do you think of the revised version?
I don't think this works. For one there might be users of the blktrace
ioctl that explicitly rely on this not happening as difference processes
might start the tracing vs actually consume the trace data. Second this
might not actually work as another process could be the last opener.
If you want to fix this for the blktrace tool (common) case I think we
need a new ioctl that explicitly ties the buffer lifetime to the fd.
next prev parent reply other threads:[~2021-04-06 6:30 UTC|newest]
Thread overview: 13+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-03-23 8:14 [PATCH 0/2] blktrace: fix trace buffer leak and limit trace buffer size Ming Lei
2021-03-23 8:14 ` [PATCH 1/2] block: shutdown blktrace in case of fatal signal pending Ming Lei
2021-03-30 16:53 ` Christoph Hellwig
2021-03-31 0:16 ` Ming Lei
2021-04-02 17:27 ` Christoph Hellwig
2021-04-03 8:10 ` Ming Lei
2021-04-03 9:04 ` Ming Lei
2021-04-06 6:30 ` Christoph Hellwig [this message]
2021-03-23 8:14 ` [PATCH 2/2] blktrace: limit allowed total trace buffer size Ming Lei
2021-03-30 2:57 ` Su Yue
2021-03-30 3:55 ` Ming Lei
2021-03-30 16:57 ` Christoph Hellwig
2021-03-30 2:04 ` [PATCH 0/2] blktrace: fix trace buffer leak and limit " Ming Lei
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