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authorMatthew Wilcox <mawilcox@microsoft.com>2018-06-07 17:10:45 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-06-07 17:34:39 -0700
commitb94078e69533ba237e2c229bca61bae47e6fafcc (patch)
tree2122fc9875a583326661ca72092b1b0f325d8ffd /lib
parentca1250bbd4e0b852cafbc94d4d2610171107b252 (diff)
downloadlinux-0-day-b94078e69533ba237e2c229bca61bae47e6fafcc.tar.gz
linux-0-day-b94078e69533ba237e2c229bca61bae47e6fafcc.tar.xz
lib/idr.c: remove simple_ida_lock
Improve the scalability of the IDA by using the per-IDA xa_lock rather than the global simple_ida_lock. IDAs are not typically used in performance-sensitive locations, but since we have this lock anyway, we can use it. It is also a step towards converting the IDA from the radix tree to the XArray. [akpm@linux-foundation.org: idr.c needs xarray.h] Link: http://lkml.kernel.org/r/20180331125332.GF13332@bombadil.infradead.org Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Rasmus Villemoes <linux@rasmusvillemoes.dk> Cc: Daniel Vetter <daniel.vetter@ffwll.ch> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/idr.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/lib/idr.c b/lib/idr.c
index 823b813f08f8..ed9c169c12bd 100644
--- a/lib/idr.c
+++ b/lib/idr.c
@@ -4,9 +4,9 @@
#include <linux/idr.h>
#include <linux/slab.h>
#include <linux/spinlock.h>
+#include <linux/xarray.h>
DEFINE_PER_CPU(struct ida_bitmap *, ida_bitmap);
-static DEFINE_SPINLOCK(simple_ida_lock);
/**
* idr_alloc_u32() - Allocate an ID.
@@ -581,7 +581,7 @@ again:
if (!ida_pre_get(ida, gfp_mask))
return -ENOMEM;
- spin_lock_irqsave(&simple_ida_lock, flags);
+ xa_lock_irqsave(&ida->ida_rt, flags);
ret = ida_get_new_above(ida, start, &id);
if (!ret) {
if (id > max) {
@@ -591,7 +591,7 @@ again:
ret = id;
}
}
- spin_unlock_irqrestore(&simple_ida_lock, flags);
+ xa_unlock_irqrestore(&ida->ida_rt, flags);
if (unlikely(ret == -EAGAIN))
goto again;
@@ -615,8 +615,8 @@ void ida_simple_remove(struct ida *ida, unsigned int id)
unsigned long flags;
BUG_ON((int)id < 0);
- spin_lock_irqsave(&simple_ida_lock, flags);
+ xa_lock_irqsave(&ida->ida_rt, flags);
ida_remove(ida, id);
- spin_unlock_irqrestore(&simple_ida_lock, flags);
+ xa_unlock_irqrestore(&ida->ida_rt, flags);
}
EXPORT_SYMBOL(ida_simple_remove);