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mm: turn vmap_purge_lock into a mutex

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The purge_lock spinlock causes high latencies with non RT kernel.  This
has been reported multiple times on lkml [1] [2] and affects
applications like audio.

This patch replaces it with a mutex to allow preemption while holding
the lock.

Thanks to Joel Fernandes for the detailed report and analysis as well as
an earlier attempt at fixing this issue.

[1] http://lists.openwall.net/linux-kernel/2016/03/23/29
[2] https://lkml.org/lkml/2016/10/9/59

Link: http://lkml.kernel.org/r/1479474236-4139-10-git-send-email-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Tested-by: Jisheng Zhang <jszhang@marvell.com>
Cc: Andrey Ryabinin <aryabinin@virtuozzo.com>
Cc: Joel Fernandes <joelaf@google.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: John Dias <joaodias@google.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Christoph Hellwig 2016-12-12 16:44:23 -08:00 committed by Linus Torvalds
parent 5803ed292e
commit f9e0997767
1 changed files with 7 additions and 7 deletions
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14
mm/vmalloc.c
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@ -606,7 +606,7 @@ static atomic_t vmap_lazy_nr = ATOMIC_INIT(0);
* by this look, but we want to avoid concurrent calls for performance
* reasons and to make the pcpu_get_vm_areas more deterministic.
*/
static DEFINE_SPINLOCK(vmap_purge_lock);
static DEFINE_MUTEX(vmap_purge_lock);
/* for per-CPU blocks */
static void purge_fragmented_blocks_allcpus(void);
@ -660,9 +660,9 @@ static bool __purge_vmap_area_lazy(unsigned long start, unsigned long end)
*/
static void try_purge_vmap_area_lazy(void)
{
if (spin_trylock(&vmap_purge_lock)) {
if (mutex_trylock(&vmap_purge_lock)) {
__purge_vmap_area_lazy(ULONG_MAX, 0);
spin_unlock(&vmap_purge_lock);
mutex_unlock(&vmap_purge_lock);
}
}
@ -671,10 +671,10 @@ static void try_purge_vmap_area_lazy(void)
*/
static void purge_vmap_area_lazy(void)
{
spin_lock(&vmap_purge_lock);
mutex_lock(&vmap_purge_lock);
purge_fragmented_blocks_allcpus();
__purge_vmap_area_lazy(ULONG_MAX, 0);
spin_unlock(&vmap_purge_lock);
mutex_unlock(&vmap_purge_lock);
}
/*
@ -1063,11 +1063,11 @@ void vm_unmap_aliases(void)
rcu_read_unlock();
}
spin_lock(&vmap_purge_lock);
mutex_lock(&vmap_purge_lock);
purge_fragmented_blocks_allcpus();
if (!__purge_vmap_area_lazy(start, end) && flush)
flush_tlb_kernel_range(start, end);
spin_unlock(&vmap_purge_lock);
mutex_unlock(&vmap_purge_lock);
}
EXPORT_SYMBOL_GPL(vm_unmap_aliases);