percpu_counter: Rename __percpu_counter_add to percpu_counter_add_batch

Currently, percpu_counter_add is a wrapper around __percpu_counter_add
which is preempt safe due to explicit calls to preempt_disable.  Given
how __ prefix is used in percpu related interfaces, the naming
unfortunately creates the false sense that __percpu_counter_add is
less safe than percpu_counter_add.  In terms of context-safety,
they're equivalent.  The only difference is that the __ version takes
a batch parameter.

Make this a bit more explicit by just renaming __percpu_counter_add to
percpu_counter_add_batch.

This patch doesn't cause any functional changes.

tj: Minor updates to patch description for clarity.  Cosmetic
    indentation updates.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Chris Mason <clm@fb.com>
Cc: Josef Bacik <jbacik@fb.com>
Cc: David Sterba <dsterba@suse.com>
Cc: Darrick J. Wong <darrick.wong@oracle.com>
Cc: Jan Kara <jack@suse.com>
Cc: Jens Axboe <axboe@fb.com>
Cc: linux-mm@kvack.org
Cc: "David S. Miller" <davem@davemloft.net>
This commit is contained in:
Nikolay Borisov 2017-06-20 21:01:20 +03:00 committed by Tejun Heo
parent df95e795a7
commit 104b4e5139
11 changed files with 31 additions and 30 deletions

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@ -1255,9 +1255,9 @@ void clean_tree_block(struct btrfs_fs_info *fs_info,
btrfs_assert_tree_locked(buf);
if (test_and_clear_bit(EXTENT_BUFFER_DIRTY, &buf->bflags)) {
__percpu_counter_add(&fs_info->dirty_metadata_bytes,
-buf->len,
fs_info->dirty_metadata_batch);
percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
-buf->len,
fs_info->dirty_metadata_batch);
/* ugh, clear_extent_buffer_dirty needs to lock the page */
btrfs_set_lock_blocking(buf);
clear_extent_buffer_dirty(buf);
@ -4046,9 +4046,9 @@ void btrfs_mark_buffer_dirty(struct extent_buffer *buf)
buf->start, transid, fs_info->generation);
was_dirty = set_extent_buffer_dirty(buf);
if (!was_dirty)
__percpu_counter_add(&fs_info->dirty_metadata_bytes,
buf->len,
fs_info->dirty_metadata_batch);
percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
buf->len,
fs_info->dirty_metadata_batch);
#ifdef CONFIG_BTRFS_FS_CHECK_INTEGRITY
if (btrfs_header_level(buf) == 0 && check_leaf(root, buf)) {
btrfs_print_leaf(fs_info, buf);

View File

@ -3584,9 +3584,9 @@ lock_extent_buffer_for_io(struct extent_buffer *eb,
set_bit(EXTENT_BUFFER_WRITEBACK, &eb->bflags);
spin_unlock(&eb->refs_lock);
btrfs_set_header_flag(eb, BTRFS_HEADER_FLAG_WRITTEN);
__percpu_counter_add(&fs_info->dirty_metadata_bytes,
-eb->len,
fs_info->dirty_metadata_batch);
percpu_counter_add_batch(&fs_info->dirty_metadata_bytes,
-eb->len,
fs_info->dirty_metadata_batch);
ret = 1;
} else {
spin_unlock(&eb->refs_lock);

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@ -1682,8 +1682,8 @@ static void btrfs_set_bit_hook(struct inode *inode,
if (btrfs_is_testing(fs_info))
return;
__percpu_counter_add(&fs_info->delalloc_bytes, len,
fs_info->delalloc_batch);
percpu_counter_add_batch(&fs_info->delalloc_bytes, len,
fs_info->delalloc_batch);
spin_lock(&BTRFS_I(inode)->lock);
BTRFS_I(inode)->delalloc_bytes += len;
if (*bits & EXTENT_DEFRAG)
@ -1749,8 +1749,8 @@ static void btrfs_clear_bit_hook(struct btrfs_inode *inode,
&inode->vfs_inode,
state->start, len);
__percpu_counter_add(&fs_info->delalloc_bytes, -len,
fs_info->delalloc_batch);
percpu_counter_add_batch(&fs_info->delalloc_bytes, -len,
fs_info->delalloc_batch);
spin_lock(&inode->lock);
inode->delalloc_bytes -= len;
if (do_list && inode->delalloc_bytes == 0 &&

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@ -1209,7 +1209,7 @@ xfs_mod_icount(
struct xfs_mount *mp,
int64_t delta)
{
__percpu_counter_add(&mp->m_icount, delta, XFS_ICOUNT_BATCH);
percpu_counter_add_batch(&mp->m_icount, delta, XFS_ICOUNT_BATCH);
if (__percpu_counter_compare(&mp->m_icount, 0, XFS_ICOUNT_BATCH) < 0) {
ASSERT(0);
percpu_counter_add(&mp->m_icount, -delta);
@ -1288,7 +1288,7 @@ xfs_mod_fdblocks(
else
batch = XFS_FDBLOCKS_BATCH;
__percpu_counter_add(&mp->m_fdblocks, delta, batch);
percpu_counter_add_batch(&mp->m_fdblocks, delta, batch);
if (__percpu_counter_compare(&mp->m_fdblocks, mp->m_alloc_set_aside,
XFS_FDBLOCKS_BATCH) >= 0) {
/* we had space! */

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@ -66,7 +66,7 @@ static inline bool bdi_has_dirty_io(struct backing_dev_info *bdi)
static inline void __add_wb_stat(struct bdi_writeback *wb,
enum wb_stat_item item, s64 amount)
{
__percpu_counter_add(&wb->stat[item], amount, WB_STAT_BATCH);
percpu_counter_add_batch(&wb->stat[item], amount, WB_STAT_BATCH);
}
static inline void __inc_wb_stat(struct bdi_writeback *wb,

View File

@ -518,7 +518,7 @@ static inline void blkg_stat_exit(struct blkg_stat *stat)
*/
static inline void blkg_stat_add(struct blkg_stat *stat, uint64_t val)
{
__percpu_counter_add(&stat->cpu_cnt, val, BLKG_STAT_CPU_BATCH);
percpu_counter_add_batch(&stat->cpu_cnt, val, BLKG_STAT_CPU_BATCH);
}
/**
@ -597,14 +597,14 @@ static inline void blkg_rwstat_add(struct blkg_rwstat *rwstat,
else
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_READ];
__percpu_counter_add(cnt, val, BLKG_STAT_CPU_BATCH);
percpu_counter_add_batch(cnt, val, BLKG_STAT_CPU_BATCH);
if (op_is_sync(op))
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_SYNC];
else
cnt = &rwstat->cpu_cnt[BLKG_RWSTAT_ASYNC];
__percpu_counter_add(cnt, val, BLKG_STAT_CPU_BATCH);
percpu_counter_add_batch(cnt, val, BLKG_STAT_CPU_BATCH);
}
/**

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@ -22,7 +22,7 @@ unsigned long vm_memory_committed(void);
static inline void vm_acct_memory(long pages)
{
__percpu_counter_add(&vm_committed_as, pages, vm_committed_as_batch);
percpu_counter_add_batch(&vm_committed_as, pages, vm_committed_as_batch);
}
static inline void vm_unacct_memory(long pages)

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@ -39,7 +39,8 @@ int __percpu_counter_init(struct percpu_counter *fbc, s64 amount, gfp_t gfp,
void percpu_counter_destroy(struct percpu_counter *fbc);
void percpu_counter_set(struct percpu_counter *fbc, s64 amount);
void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch);
void percpu_counter_add_batch(struct percpu_counter *fbc, s64 amount,
s32 batch);
s64 __percpu_counter_sum(struct percpu_counter *fbc);
int __percpu_counter_compare(struct percpu_counter *fbc, s64 rhs, s32 batch);
@ -50,7 +51,7 @@ static inline int percpu_counter_compare(struct percpu_counter *fbc, s64 rhs)
static inline void percpu_counter_add(struct percpu_counter *fbc, s64 amount)
{
__percpu_counter_add(fbc, amount, percpu_counter_batch);
percpu_counter_add_batch(fbc, amount, percpu_counter_batch);
}
static inline s64 percpu_counter_sum_positive(struct percpu_counter *fbc)
@ -136,7 +137,7 @@ percpu_counter_add(struct percpu_counter *fbc, s64 amount)
}
static inline void
__percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
percpu_counter_add_batch(struct percpu_counter *fbc, s64 amount, s32 batch)
{
percpu_counter_add(fbc, amount);
}

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@ -154,12 +154,12 @@ static inline int frag_mem_limit(struct netns_frags *nf)
static inline void sub_frag_mem_limit(struct netns_frags *nf, int i)
{
__percpu_counter_add(&nf->mem, -i, frag_percpu_counter_batch);
percpu_counter_add_batch(&nf->mem, -i, frag_percpu_counter_batch);
}
static inline void add_frag_mem_limit(struct netns_frags *nf, int i)
{
__percpu_counter_add(&nf->mem, i, frag_percpu_counter_batch);
percpu_counter_add_batch(&nf->mem, i, frag_percpu_counter_batch);
}
static inline unsigned int sum_frag_mem_limit(struct netns_frags *nf)

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@ -207,7 +207,7 @@ static void fprop_reflect_period_percpu(struct fprop_global *p,
if (val < (nr_cpu_ids * PROP_BATCH))
val = percpu_counter_sum(&pl->events);
__percpu_counter_add(&pl->events,
percpu_counter_add_batch(&pl->events,
-val + (val >> (period-pl->period)), PROP_BATCH);
} else
percpu_counter_set(&pl->events, 0);
@ -219,7 +219,7 @@ static void fprop_reflect_period_percpu(struct fprop_global *p,
void __fprop_inc_percpu(struct fprop_global *p, struct fprop_local_percpu *pl)
{
fprop_reflect_period_percpu(p, pl);
__percpu_counter_add(&pl->events, 1, PROP_BATCH);
percpu_counter_add_batch(&pl->events, 1, PROP_BATCH);
percpu_counter_add(&p->events, 1);
}
@ -267,6 +267,6 @@ void __fprop_inc_percpu_max(struct fprop_global *p,
return;
} else
fprop_reflect_period_percpu(p, pl);
__percpu_counter_add(&pl->events, 1, PROP_BATCH);
percpu_counter_add_batch(&pl->events, 1, PROP_BATCH);
percpu_counter_add(&p->events, 1);
}

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@ -72,7 +72,7 @@ void percpu_counter_set(struct percpu_counter *fbc, s64 amount)
}
EXPORT_SYMBOL(percpu_counter_set);
void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
void percpu_counter_add_batch(struct percpu_counter *fbc, s64 amount, s32 batch)
{
s64 count;
@ -89,7 +89,7 @@ void __percpu_counter_add(struct percpu_counter *fbc, s64 amount, s32 batch)
}
preempt_enable();
}
EXPORT_SYMBOL(__percpu_counter_add);
EXPORT_SYMBOL(percpu_counter_add_batch);
/*
* Add up all the per-cpu counts, return the result. This is a more accurate