Date: Wed, 9 Apr 2014 14:41:31 +0300 From: Konstantin Belousov <kostikbel@gmail.com> To: Mateusz Guzik <mjguzik@gmail.com> Cc: freebsd-hackers@freebsd.org, Eduardo Morras <emorrasg@yahoo.es> Subject: Re: pipe() resource exhaustion Message-ID: <20140409114131.GJ21331@kib.kiev.ua> In-Reply-To: <20140409113957.GB17650@dft-labs.eu> References: <lhu0jv$r6n$1@ger.gmane.org> <ab57e60fcc1c1438fcca500e3c594d35@mail.feld.me> <20140408130206.e75f3bf6c6df28b6e4839e70@yahoo.es> <20140408121222.GB30326@dft-labs.eu> <20140408123827.GW21331@kib.kiev.ua> <20140408130727.GA11363@dft-labs.eu> <20140408132442.GZ21331@kib.kiev.ua> <20140409111654.GA17650@dft-labs.eu> <20140409112627.GI21331@kib.kiev.ua> <20140409113957.GB17650@dft-labs.eu>
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On Wed, Apr 09, 2014 at 01:39:57PM +0200, Mateusz Guzik wrote:
> On Wed, Apr 09, 2014 at 02:26:27PM +0300, Konstantin Belousov wrote:
> > > if (backing) {
> > > + /*
> > > + * Note that these functions can fail, but we ignore
> > > + * the error as it is not fatal and could be provoked
> > > + * by users.
> > > + */
> > It would be benefitial to add some more details on the way to provoke t=
he
> > failure. Note in the comment that creating too much pipes would exhaust
> > pipe map and we fall back to the buffer pipe creation there, which still
> > work correctly, albeit slow.
> >=20
>=20
> How about:
>=20
> Note that these functions can fail if pipe map is exhausted (as a result
> of too many pipes created), but we ignore the error as it is not fatal
> and could be provoked by unprivileged users. The only consequence is worse
> performance with given pipe.
Ok.
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