On Sat, Jun 08, 2019 at 10:50:51AM -0700, Linus Torvalds wrote:
> On Sat, Jun 8, 2019 at 10:42 AM Linus Torvalds
> wrote:
> >
> > There are no atomic rmw sequences that have reasonable performance for
> > the bitfield updates themselves.
>
> Note that this is purely about the writing side. Reads
On Sat, Jun 08, 2019 at 10:42:41AM -0700, Linus Torvalds wrote:
> On Sat, Jun 8, 2019 at 8:32 AM Paul E. McKenney wrote:
> >
> > On Fri, Jun 07, 2019 at 09:19:42AM -0700, Linus Torvalds wrote:
> > >
> > > - bitfields obviously do need locks. 'char' does not.
> > >
> > > If there's somebody who
On Sat, Jun 8, 2019 at 10:42 AM Linus Torvalds
wrote:
>
> There are no atomic rmw sequences that have reasonable performance for
> the bitfield updates themselves.
Note that this is purely about the writing side. Reads of bitfield
values can be (and generally _should_ be) atomic, and hopefully
On Sat, Jun 8, 2019 at 8:32 AM Paul E. McKenney wrote:
>
> On Fri, Jun 07, 2019 at 09:19:42AM -0700, Linus Torvalds wrote:
> >
> > - bitfields obviously do need locks. 'char' does not.
> >
> > If there's somebody who really notices the alpha issue in PRACTICE, we
> > can then bother to fix it.
On Fri, Jun 07, 2019 at 09:19:42AM -0700, Linus Torvalds wrote:
> On Fri, Jun 7, 2019 at 8:26 AM Eric Dumazet wrote:
> >
> > There is common knowledge among us programmers that bit fields
> > (or bool) sharing a common 'word' need to be protected
> > with a common lock.
> >
> > Converting all bit
On Fri, Jun 7, 2019 at 8:26 AM Eric Dumazet wrote:
>
> There is common knowledge among us programmers that bit fields
> (or bool) sharing a common 'word' need to be protected
> with a common lock.
>
> Converting all bit fields to plain int/long would be quite a waste of memory.
Yeah, and we
On 6/7/19 8:32 AM, Herbert Xu wrote:
> On Fri, Jun 07, 2019 at 08:26:12AM -0700, Eric Dumazet wrote:
>>
>> There is common knowledge among us programmers that bit fields
>> (or bool) sharing a common 'word' need to be protected
>> with a common lock.
>>
>> Converting all bit fields to plain
On Fri, Jun 07, 2019 at 08:26:12AM -0700, Eric Dumazet wrote:
>
> There is common knowledge among us programmers that bit fields
> (or bool) sharing a common 'word' need to be protected
> with a common lock.
>
> Converting all bit fields to plain int/long would be quite a waste of memory.
>
> In
On 6/7/19 7:09 AM, Herbert Xu wrote:
> On Tue, Jun 04, 2019 at 09:04:55AM -0700, Linus Torvalds wrote:
>>
>> In fact, the alpha port was always subtly buggy exactly because of the
>> "byte write turns into a read-and-masked-write", even if I don't think
>> anybody ever noticed (we did fix cases
On Tue, Jun 04, 2019 at 09:04:55AM -0700, Linus Torvalds wrote:
>
> In fact, the alpha port was always subtly buggy exactly because of the
> "byte write turns into a read-and-masked-write", even if I don't think
> anybody ever noticed (we did fix cases where people _did_ notice,
> though, and we
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