search for: cpu_last_stolen

...eed a lock for tag stealing by remote + * CPUs: + */ spinlock_t lock; + + /* nr_free/freelist form a stack of free IDs */ unsigned nr_free; unsigned freelist[]; }; @@ -1209,21 +1215,21 @@ static inline void steal_tags(struct percpu_ida *pool, unsigned cpus_have_tags, cpu = pool->cpu_last_stolen; struct percpu_ida_cpu *remote; - for (cpus_have_tags = bitmap_weight(pool->cpus_have_tags, nr_cpu_ids); + for (cpus_have_tags = cpumask_weight(&pool->cpus_have_tags); cpus_have_tags * IDA_PCPU_SIZE > pool->nr_tags / 2; cpus_have_tags--) { - cpu = find_next_bit(po...

...+ */ + unsigned long *cpus_have_tags; + + struct { + spinlock_t lock; + /* + * When we go to steal tags from another cpu (see steal_tags()), + * we want to pick a cpu at random. Cycling through them every + * time we steal is a bit easier and more or less equivalent: + */ + unsigned cpu_last_stolen; + + /* For sleeping on allocation failure */ + wait_queue_head_t wait; + + /* + * Global freelist - it's a stack where nr_free points to the + * top + */ + unsigned nr_free; + unsigned *freelist; + } ____cacheline_aligned_in_smp; +}; + +int percpu_ida_alloc(struct percpu_ida *pool...

...? > + struct { > + spinlock_t lock; > + /* > + * When we go to steal tags from another cpu (see steal_tags()), > + * we want to pick a cpu at random. Cycling through them every > + * time we steal is a bit easier and more or less equivalent: > + */ > + unsigned cpu_last_stolen; > + > + /* For sleeping on allocation failure */ > + wait_queue_head_t wait; > + > + /* > + * Global freelist - it's a stack where nr_free points to the > + * top > + */ > + unsigned nr_free; > + unsigned *freelist; > + } ____cacheline_aligned_in_s...

...? > + struct { > + spinlock_t lock; > + /* > + * When we go to steal tags from another cpu (see steal_tags()), > + * we want to pick a cpu at random. Cycling through them every > + * time we steal is a bit easier and more or less equivalent: > + */ > + unsigned cpu_last_stolen; > + > + /* For sleeping on allocation failure */ > + wait_queue_head_t wait; > + > + /* > + * Global freelist - it's a stack where nr_free points to the > + * top > + */ > + unsigned nr_free; > + unsigned *freelist; > + } ____cacheline_aligned_in_s...

From: Nicholas Bellinger <nab at linux-iscsi.org> Hi folks, This is an updated series for adding tag pre-allocation support of target fabric descriptor memory, utilizing Kent's latest per-cpu ida bits here, along with Christoph Lameter's latest comments: [PATCH 04/10] idr: Percpu ida http://marc.info/?l=linux-kernel&m=137160026006974&w=2 The first patch is a

From: Nicholas Bellinger <nab at linux-iscsi.org> Hi folks, This is an updated series for adding tag pre-allocation support of target fabric descriptor memory, utilizing Kent's latest per-cpu ida bits here, along with Christoph Lameter's latest comments: [PATCH 04/10] idr: Percpu ida http://marc.info/?l=linux-kernel&m=137160026006974&w=2 The first patch is a

...nlock_t lock; > > + /* > > + * When we go to steal tags from another cpu (see steal_tags()), > > + * we want to pick a cpu at random. Cycling through them every > > + * time we steal is a bit easier and more or less equivalent: > > + */ > > + unsigned cpu_last_stolen; > > + > > + /* For sleeping on allocation failure */ > > + wait_queue_head_t wait; > > + > > + /* > > + * Global freelist - it's a stack where nr_free points to the > > + * top > > + */ > > + unsigned nr_free; > > + unsign...

Removing the percpu_ida code nets over 400 lines of removal. It's not as spectacular as deleting an entire architecture, but it's still a worthy reduction in lines of code. Untested due to lack of hardware and not understanding how to set up a target platform. Changes from v1: - Fixed bugs pointed out by Jens in iscsit_wait_for_tag() - Abstracted out tag freeing as requested by Bart

Removing the percpu_ida code nets over 400 lines of removal. It's not as spectacular as deleting an entire architecture, but it's still a worthy reduction in lines of code. Untested due to lack of hardware and not understanding how to set up a target platform. Changes from v1: - Fixed bugs pointed out by Jens in iscsit_wait_for_tag() - Abstracted out tag freeing as requested by Bart

From: Matthew Wilcox <mawilcox at microsoft.com> This is a pretty rough-and-ready conversion of the target drivers from using percpu_ida to sbitmap. It compiles; I don't have a target setup, so it's completely untested. I haven't tried to do anything particularly clever here, so it's possible that, for example, the wait queue in iscsi_target_util could be more clever, like