A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-25 22:23:14 -04:00
Code Issues Projects Releases Packages Wiki Activity

Use time based periods to age the writeback proportions,

Browse source 
which can adapt equally well to fast/slow devices.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1.4.11 (GNU/Linux)
 
 iQIcBAABAgAGBQJQF0/wAAoJECvKgwp+S8JaszsP/16EO5F5mUCOFgncVRp+8R9U
 BxuKJ61j2R9ckHA+ngMEg72W5vJQds64cjywZnz6HMr0/+3tXUf4QBbU4/4sCeai
 0lpK8MCKgp5KHHCxgO8zyoSaboankUgoDcbSmGJREV1WXoR8VWXsO9gXqiiH9XOe
 e8ADjds/YdxkQbOYDRgZKvLzwWS61K9Kwq5/56GASh2uflw7rkJZ38xqvGbo3YiQ
 IJJwOUYfJjFadIewYARQmkZZyWeAmtY0ADh15Z8pJt+iY4PgcDDlaWagwUH2Oaoi
 vhTFO4KnCjhSpc872et21g/jN/VrcQqzuUF/LUE9rW5irXeDZVCDrCQOuHQ+3Uo5
 YuV3rpNABW/LU8AvtIwt9hUunaKUnrXaSluoL9LzH2VpH++JljQeR4yZ62Q5rpRs
 z4Bow25p7tlbcIJWzueMPdOFUr5s3P6XfQHoLVRWqN94eJ+Z1DPOgBlOain6cCUN
 oivPh4FxZfUscNmX8/7cHaTNEpGzJ0FzLPMNFnGQ2zwG0gk41fnMdWb19aVIE5GL
 /Q96TB24k/v+o1lbxGmyPi0L+Aq+NknvNm+p/YJHAAQrIpu5t2hPvka8/m7Nj7tu
 c3rM75RKiZkEI+3U6Ws1DhhQPtVcfNIVlNYQMGzlIndtK6T0ByueQ4eN5Z7ltjSE
 pS89rv2hyBw7yCaTU6ui
 =gZrM
 -----END PGP SIGNATURE-----

Merge tag 'writeback-proportions' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux

Pull writeback updates from Wu Fengguang:
 "Use time based periods to age the writeback proportions, which can
  adapt equally well to fast/slow devices."

Fix up trivial conflict in comment in fs/sync.c

* tag 'writeback-proportions' of git://git.kernel.org/pub/scm/linux/kernel/git/wfg/linux:
  writeback: Fix some comment errors
  block: Convert BDI proportion calculations to flexible proportions
  lib: Fix possible deadlock in flexible proportion code
  lib: Proportions with flexible period
This commit is contained in:
Linus Torvalds 2012-07-30 22:14:04 -07:00
commit 2e3ee61348
8 changed files with 448 additions and 50 deletions
Download patch file Download diff file Expand all files Collapse all files

4
include/linux/backing-dev.h
View file

@ -10,7 +10,7 @@
#include <linux/percpu_counter.h>
#include <linux/log2.h>
#include <linux/proportions.h>
#include <linux/flex_proportions.h>
#include <linux/kernel.h>
#include <linux/fs.h>
#include <linux/sched.h>
@ -89,7 +89,7 @@ struct backing_dev_info {
unsigned long dirty_ratelimit;
unsigned long balanced_dirty_ratelimit;
struct prop_local_percpu completions;
struct fprop_local_percpu completions;
int dirty_exceeded;
unsigned int min_ratio;

101
include/linux/flex_proportions.h Normal file
View file

@ -0,0 +1,101 @@
/*
* Floating proportions with flexible aging period
*
* Copyright (C) 2011, SUSE, Jan Kara <jack@suse.cz>
*/
#ifndef _LINUX_FLEX_PROPORTIONS_H
#define _LINUX_FLEX_PROPORTIONS_H
#include <linux/percpu_counter.h>
#include <linux/spinlock.h>
#include <linux/seqlock.h>
/*
* When maximum proportion of some event type is specified, this is the
* precision with which we allow limitting. Note that this creates an upper
* bound on the number of events per period like
* ULLONG_MAX >> FPROP_FRAC_SHIFT.
*/
#define FPROP_FRAC_SHIFT 10
#define FPROP_FRAC_BASE (1UL << FPROP_FRAC_SHIFT)
/*
* ---- Global proportion definitions ----
*/
struct fprop_global {
/* Number of events in the current period */
struct percpu_counter events;
/* Current period */
unsigned int period;
/* Synchronization with period transitions */
seqcount_t sequence;
};
int fprop_global_init(struct fprop_global *p);
void fprop_global_destroy(struct fprop_global *p);
bool fprop_new_period(struct fprop_global *p, int periods);
/*
* ---- SINGLE ----
*/
struct fprop_local_single {
/* the local events counter */
unsigned long events;
/* Period in which we last updated events */
unsigned int period;
raw_spinlock_t lock; /* Protect period and numerator */
};
#define INIT_FPROP_LOCAL_SINGLE(name) \
{ .lock = __RAW_SPIN_LOCK_UNLOCKED(name.lock), \
}
int fprop_local_init_single(struct fprop_local_single *pl);
void fprop_local_destroy_single(struct fprop_local_single *pl);
void __fprop_inc_single(struct fprop_global *p, struct fprop_local_single *pl);
void fprop_fraction_single(struct fprop_global *p,
struct fprop_local_single *pl, unsigned long *numerator,
unsigned long *denominator);
static inline
void fprop_inc_single(struct fprop_global *p, struct fprop_local_single *pl)
{
unsigned long flags;
local_irq_save(flags);
__fprop_inc_single(p, pl);
local_irq_restore(flags);
}
/*
* ---- PERCPU ----
*/
struct fprop_local_percpu {
/* the local events counter */
struct percpu_counter events;
/* Period in which we last updated events */
unsigned int period;
raw_spinlock_t lock; /* Protect period and numerator */
};
int fprop_local_init_percpu(struct fprop_local_percpu *pl);
void fprop_local_destroy_percpu(struct fprop_local_percpu *pl);
void __fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl);
void __fprop_inc_percpu_max(struct fprop_global *p, struct fprop_local_percpu *pl,
int max_frac);
void fprop_fraction_percpu(struct fprop_global *p,
struct fprop_local_percpu *pl, unsigned long *numerator,
unsigned long *denominator);
static inline
void fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl)
{
unsigned long flags;
local_irq_save(flags);
__fprop_inc_percpu(p, pl);
local_irq_restore(flags);
}
#endif