On Friday 22 June 2007, Steven Rostedt wrote:
> This patch creates an alternative for drivers from using tasklets.
> It creates a "work_tasklet". When configured to use work_tasklets
> instead of tasklets, instead of creating tasklets, a work queue
> is made in its place. The API is still the same, and the drivers
> don't know that a work queue is being used.
>
Perhaps the API can be slimmed down in the process, because half
of the tasklet interface functions are hardly used at all.
> +#define DECLARE_TASKLET(name, func, data) \
> + struct tasklet_struct name = { \
> + __WORK_INITIALIZER((name).work, work_tasklet_exec), \
> + LIST_HEAD_INIT((name).list), \
> + 0, \
> + ATOMIC_INIT(0), \
> + func, \
> + data, \
> + #name \
> + }
18 users of this macro. Maybe too much for the start, but if we convert
all of them to use either tasklet_init or use work queues directly,
the macro can go away.
> +#define DECLARE_TASKLET_DISABLED(name, func, data) \
> + struct tasklet_struct name = { \
> + __WORK_INITIALIZER((name).work, work_tasklet_exec), \
> + LIST_HEAD_INIT((name).list), \
> + 0, \
> + ATOMIC_INIT(1), \
> + func, \
> + data, \
> + #name \
> + }
this one is easier, there are only four users in total: three input
drivers, and tipc.
> +void tasklet_schedule(struct tasklet_struct *t);
> +#define tasklet_hi_schedule tasklet_schedule
> +extern fastcall void tasklet_enable(struct tasklet_struct *t);
> +#define tasklet_hi_enable tasklet_enable
there are 34 files using tasklet_hi_* functions. In theory, these
could be converted to the non-hi version with a simple search and
replace, if it's clear that there is not much point in keeping them.
The most common use of tasklet_hi is in the alsa drivers. If it
actually makes a difference for them already, maybe there should
be an alsa softirq instead of moving them all over to work queues.
> +void tasklet_disable_nosync(struct tasklet_struct *t);
only has two users, bcm43xx and sc92031. If both are
converted to workqueue, the interface removed can be
removed.
> +extern void tasklet_kill_immediate(struct tasklet_struct *t, unsigned int cpu);
only one user in total, rcupdate.c. You already take care of that,
it seems the declaration is just a leftover.
Arnd <><
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