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Message-ID: <20130603155612.GD4224@phenom.dumpdata.com>
Date: Mon, 3 Jun 2013 11:56:12 -0400
From: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
To: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Cc: gleb@...hat.com, mingo@...hat.com, jeremy@...p.org, x86@...nel.org,
hpa@...or.com, pbonzini@...hat.com, linux-doc@...r.kernel.org,
habanero@...ux.vnet.ibm.com, xen-devel@...ts.xensource.com,
peterz@...radead.org, mtosatti@...hat.com,
stefano.stabellini@...citrix.com, andi@...stfloor.org,
attilio.rao@...rix.com, ouyang@...pitt.edu, gregkh@...e.de,
agraf@...e.de, chegu_vinod@...com, torvalds@...ux-foundation.org,
avi.kivity@...il.com, tglx@...utronix.de, kvm@...r.kernel.org,
linux-kernel@...r.kernel.org, stephan.diestelhorst@....com,
riel@...hat.com, drjones@...hat.com,
virtualization@...ts.linux-foundation.org,
srivatsa.vaddagiri@...il.com
Subject: Re: [PATCH RFC V9 9/19] Split out rate limiting from jump_label.h
On Sun, Jun 02, 2013 at 12:54:22AM +0530, Raghavendra K T wrote:
> Split jumplabel ratelimit
I would change the title a bit, perhaps prefix it with: "jump_label: "
>
> From: Andrew Jones <drjones@...hat.com>
>
> Commit b202952075f62603bea9bfb6ebc6b0420db11949 introduced rate limiting
Also please add right after the git id this:
("perf, core: Rate limit perf_sched_events jump_label patching")
> for jump label disabling. The changes were made in the jump label code
> in order to be more widely available and to keep things tidier. This is
> all fine, except now jump_label.h includes linux/workqueue.h, which
> makes it impossible to include jump_label.h from anything that
> workqueue.h needs. For example, it's now impossible to include
> jump_label.h from asm/spinlock.h, which is done in proposed
> pv-ticketlock patches. This patch splits out the rate limiting related
> changes from jump_label.h into a new file, jump_label_ratelimit.h, to
> resolve the issue.
>
> Signed-off-by: Andrew Jones <drjones@...hat.com>
> Signed-off-by: Raghavendra K T <raghavendra.kt@...ux.vnet.ibm.com>
Otherwise looks fine to me:
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@...cle.com>
> ---
> include/linux/jump_label.h | 26 +-------------------------
> include/linux/jump_label_ratelimit.h | 34 ++++++++++++++++++++++++++++++++++
> include/linux/perf_event.h | 1 +
> kernel/jump_label.c | 1 +
> 4 files changed, 37 insertions(+), 25 deletions(-)
> create mode 100644 include/linux/jump_label_ratelimit.h
>
> diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
> index 0976fc4..53cdf89 100644
> --- a/include/linux/jump_label.h
> +++ b/include/linux/jump_label.h
> @@ -48,7 +48,6 @@
>
> #include <linux/types.h>
> #include <linux/compiler.h>
> -#include <linux/workqueue.h>
>
> #if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
>
> @@ -61,12 +60,6 @@ struct static_key {
> #endif
> };
>
> -struct static_key_deferred {
> - struct static_key key;
> - unsigned long timeout;
> - struct delayed_work work;
> -};
> -
> # include <asm/jump_label.h>
> # define HAVE_JUMP_LABEL
> #endif /* CC_HAVE_ASM_GOTO && CONFIG_JUMP_LABEL */
> @@ -119,10 +112,7 @@ extern void arch_jump_label_transform_static(struct jump_entry *entry,
> extern int jump_label_text_reserved(void *start, void *end);
> extern void static_key_slow_inc(struct static_key *key);
> extern void static_key_slow_dec(struct static_key *key);
> -extern void static_key_slow_dec_deferred(struct static_key_deferred *key);
> extern void jump_label_apply_nops(struct module *mod);
> -extern void
> -jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
>
> #define STATIC_KEY_INIT_TRUE ((struct static_key) \
> { .enabled = ATOMIC_INIT(1), .entries = (void *)1 })
> @@ -141,10 +131,6 @@ static __always_inline void jump_label_init(void)
> {
> }
>
> -struct static_key_deferred {
> - struct static_key key;
> -};
> -
> static __always_inline bool static_key_false(struct static_key *key)
> {
> if (unlikely(atomic_read(&key->enabled)) > 0)
> @@ -169,11 +155,6 @@ static inline void static_key_slow_dec(struct static_key *key)
> atomic_dec(&key->enabled);
> }
>
> -static inline void static_key_slow_dec_deferred(struct static_key_deferred *key)
> -{
> - static_key_slow_dec(&key->key);
> -}
> -
> static inline int jump_label_text_reserved(void *start, void *end)
> {
> return 0;
> @@ -187,12 +168,6 @@ static inline int jump_label_apply_nops(struct module *mod)
> return 0;
> }
>
> -static inline void
> -jump_label_rate_limit(struct static_key_deferred *key,
> - unsigned long rl)
> -{
> -}
> -
> #define STATIC_KEY_INIT_TRUE ((struct static_key) \
> { .enabled = ATOMIC_INIT(1) })
> #define STATIC_KEY_INIT_FALSE ((struct static_key) \
> @@ -203,6 +178,7 @@ jump_label_rate_limit(struct static_key_deferred *key,
> #define STATIC_KEY_INIT STATIC_KEY_INIT_FALSE
> #define jump_label_enabled static_key_enabled
>
> +static inline int atomic_read(const atomic_t *v);
> static inline bool static_key_enabled(struct static_key *key)
> {
> return (atomic_read(&key->enabled) > 0);
> diff --git a/include/linux/jump_label_ratelimit.h b/include/linux/jump_label_ratelimit.h
> new file mode 100644
> index 0000000..1137883
> --- /dev/null
> +++ b/include/linux/jump_label_ratelimit.h
> @@ -0,0 +1,34 @@
> +#ifndef _LINUX_JUMP_LABEL_RATELIMIT_H
> +#define _LINUX_JUMP_LABEL_RATELIMIT_H
> +
> +#include <linux/jump_label.h>
> +#include <linux/workqueue.h>
> +
> +#if defined(CC_HAVE_ASM_GOTO) && defined(CONFIG_JUMP_LABEL)
> +struct static_key_deferred {
> + struct static_key key;
> + unsigned long timeout;
> + struct delayed_work work;
> +};
> +#endif
> +
> +#ifdef HAVE_JUMP_LABEL
> +extern void static_key_slow_dec_deferred(struct static_key_deferred *key);
> +extern void
> +jump_label_rate_limit(struct static_key_deferred *key, unsigned long rl);
> +
> +#else /* !HAVE_JUMP_LABEL */
> +struct static_key_deferred {
> + struct static_key key;
> +};
> +static inline void static_key_slow_dec_deferred(struct static_key_deferred *key)
> +{
> + static_key_slow_dec(&key->key);
> +}
> +static inline void
> +jump_label_rate_limit(struct static_key_deferred *key,
> + unsigned long rl)
> +{
> +}
> +#endif /* HAVE_JUMP_LABEL */
> +#endif /* _LINUX_JUMP_LABEL_RATELIMIT_H */
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index f463a46..a8eac60 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -48,6 +48,7 @@ struct perf_guest_info_callbacks {
> #include <linux/cpu.h>
> #include <linux/irq_work.h>
> #include <linux/static_key.h>
> +#include <linux/jump_label_ratelimit.h>
> #include <linux/atomic.h>
> #include <linux/sysfs.h>
> #include <linux/perf_regs.h>
> diff --git a/kernel/jump_label.c b/kernel/jump_label.c
> index 60f48fa..297a924 100644
> --- a/kernel/jump_label.c
> +++ b/kernel/jump_label.c
> @@ -13,6 +13,7 @@
> #include <linux/sort.h>
> #include <linux/err.h>
> #include <linux/static_key.h>
> +#include <linux/jump_label_ratelimit.h>
>
> #ifdef HAVE_JUMP_LABEL
>
>
--
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