linux-kernel - Re: [PATCH v5 06/10] Uprobes: Support SDT markers having reference count (semaphore)

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Message-ID: <20180702180529.GB31400@redhat.com>
Date:   Mon, 2 Jul 2018 20:05:29 +0200
From:   Oleg Nesterov <oleg@...hat.com>
To:     Srikar Dronamraju <srikar@...ux.vnet.ibm.com>
Cc:     Ravi Bangoria <ravi.bangoria@...ux.ibm.com>, rostedt@...dmis.org,
        mhiramat@...nel.org, peterz@...radead.org, mingo@...hat.com,
        acme@...nel.org, alexander.shishkin@...ux.intel.com,
        jolsa@...hat.com, namhyung@...nel.org,
        linux-kernel@...r.kernel.org, corbet@....net,
        linux-doc@...r.kernel.org, ananth@...ux.vnet.ibm.com,
        alexis.berlemont@...il.com, naveen.n.rao@...ux.vnet.ibm.com,
        linux-arm-kernel@...ts.infradead.org, linux-mips@...ux-mips.org,
        linux@...linux.org.uk, ralf@...ux-mips.org, paul.burton@...s.com
Subject: Re: [PATCH v5 06/10] Uprobes: Support SDT markers having reference
 count (semaphore)

On 07/02, Srikar Dronamraju wrote:
>
> > Implement the reference counter logic in core uprobe. User will be
> > able to use it from trace_uprobe as well as from kernel module. New
> > trace_uprobe definition with reference counter will now be:
> >
> >     <path>:<offset>[(ref_ctr_offset)]
> >
> > where ref_ctr_offset is an optional field. For kernel module, new
> > variant of uprobe_register() has been introduced:
> >
> >     uprobe_register_refctr(inode, offset, ref_ctr_offset, consumer)
> >
>
> Sorry for bringing this again, but I would actually think the ref_ctr is
> a consumer property. i.e the ref_ctr_offset should be part of
> uprobe_consumer.

Damn yes ;) I was thinking about this too but decided to discuss this later.

But this probably means more complications, I am not sure about the actual
implementation.

Oleg.