Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]

Groups > linux.kernel > #1611706 > unrolled thread

Re: [PATCH 1/5] locking: Introduce range reader/writer lock

Back to article view | Back to linux.kernel

This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by below is the oldest one visible, not the original post.

Contents

  Re: [PATCH 1/5] locking: Introduce range reader/writer lock Peter Zijlstra <peterz@infradead.org> - 2017-03-29 11:00 +0200

#1611706 — Re: [PATCH 1/5] locking: Introduce range reader/writer lock

On Mon, Mar 06, 2017 at 09:03:26PM -0800, Davidlohr Bueso wrote:
> +++ b/kernel/locking/range_rwlock.c
> @@ -0,0 +1,462 @@
> +/*
> + * Implementation of read/write range locks.
> + *
> + * We keep interval tree of locked and to-be-locked ranges. When new range lock
> + * is requested, we add its interval to the tree and store number of intervals
> + * intersecting it to 'blocking_ranges'.
> + *
> + * When a range is unlocked, we again walk intervals that intersect with the
> + * unlocked one and decrement their 'blocking_ranges'. We wake up owner of any
> + * range lock whose 'blocking_ranges' drops to 0. For the shared case, the
> + * 'blocking_ranges' is only incremented if the intersecting range is not marked
> + * as a reader. In order to mitigate some of the tree walk overhead for
> + * non-intersecting ranges, the tree's min/max values are maintained and consulted
> + * in O(1) in the fastpath.
> + */

Was your editor broken? Those lines are > 80 for no reason what so ever.

[toc] | [standalone]

Back to top | Article view | linux.kernel

csiph-web