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SubjectRe: [PATCH v5 3/4] apparmor: experiment with faster backoff on global buffer
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Instead of doubling hold count when contention is encounter increase
it by 8x. This makes for a faster back off, but results in buffers
being held longer.

Signed-off-by: John Johansen <john.johansen@canonical.com>
---
security/apparmor/lsm.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/security/apparmor/lsm.c b/security/apparmor/lsm.c
index fd6779ff0da4..52423d88854a 100644
--- a/security/apparmor/lsm.c
+++ b/security/apparmor/lsm.c
@@ -1796,10 +1796,10 @@ static int param_set_mode(const char *val, const struct kernel_param *kp)

static void update_contention(struct aa_local_cache *cache)
{
- cache->contention += 1;
+ cache->contention += 3;
if (cache->contention > 9)
cache->contention = 9;
- cache->hold += 1 << cache->contention; /* 2, 4, 8, ... */
+ cache->hold += 1 << cache->contention; /* 8, 64, 512, ... */
}

char *aa_get_buffer(bool in_atomic)
--
2.34.1

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