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Groups > linux.kernel > #1725889
| From | Peter Zijlstra <peterz@infradead.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions |
| Date | 2017-09-04 09:40 +0200 |
| Message-ID | <ulU9b-2BO-5@gated-at.bofh.it> (permalink) |
| References | (1 earlier) <ukXiN-7Ew-1@gated-at.bofh.it> <ukWmK-71s-3@gated-at.bofh.it> <ukWmL-71s-37@gated-at.bofh.it> <ul1w6-288-11@gated-at.bofh.it> <ul34R-32l-15@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, Sep 01, 2017 at 11:51:53PM +0100, David Howells wrote:
> Peter Zijlstra <peterz@infradead.org> wrote:
>
> > if (obj) {
> > /* use obj */
> > refcount_dec(&obj->refs); /* should never hit 0 */
> > }
>
> You've missed a bit: We need to tell the gc to run when we reduce the refcount
> to 1:
>
> if (obj) {
> ...
> if (refcount_dec_return(&obj->refs) == 1)
> schedule_gc();
> }
Ah, so that isn't fundamental to having a GC. But yes if that's your
requirement, then this makes sense.
Please clarify in the Changelog.
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[RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions David Howells <dhowells@redhat.com> - 2017-09-01 17:50 +0200
Re: [RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions Peter Zijlstra <peterz@infradead.org> - 2017-09-01 18:50 +0200
Re: [RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions David Howells <dhowells@redhat.com> - 2017-09-01 23:20 +0200
Re: [RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions Peter Zijlstra <peterz@infradead.org> - 2017-09-02 00:00 +0200
Re: [RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions Peter Zijlstra <peterz@infradead.org> - 2017-09-02 00:10 +0200
Re: [RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions David Howells <dhowells@redhat.com> - 2017-09-02 01:00 +0200
Re: [RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions Peter Zijlstra <peterz@infradead.org> - 2017-09-04 09:40 +0200
Re: [RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions Christoph Hellwig <hch@infradead.org> - 2017-09-04 17:40 +0200
Re: [RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions David Howells <dhowells@redhat.com> - 2017-09-04 18:10 +0200
Re: [RFC PATCH 02/11] refcount: Implement inc/decrement-and-return functions Christoph Hellwig <hch@infradead.org> - 2017-09-05 08:50 +0200
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