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random: push extra entropy to the output pools

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As the input pool gets filled, start transfering entropy to the output
pools until they get filled.  This allows us to use the output pools
to store more system entropy.  Waste not, want not....

Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Theodore Ts'o
2013-10-03 01:08:15 -04:00
parent 95b709b6be
commit 6265e169cd
2 changed files with 105 additions and 29 deletions
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22
include/trace/events/random.h
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@@ -87,6 +87,28 @@ TRACE_EVENT(credit_entropy_bits,
(void *)__entry->IP)
);
TRACE_EVENT(push_to_pool,
TP_PROTO(const char *pool_name, int pool_bits, int input_bits),
TP_ARGS(pool_name, pool_bits, input_bits),
TP_STRUCT__entry(
__field( const char *, pool_name )
__field( int, pool_bits )
__field( int, input_bits )
),
TP_fast_assign(
__entry->pool_name = pool_name;
__entry->pool_bits = pool_bits;
__entry->input_bits = input_bits;
),
TP_printk("%s: pool_bits %d input_pool_bits %d",
__entry->pool_name, __entry->pool_bits,
__entry->input_bits)
);
DECLARE_EVENT_CLASS(random__get_random_bytes,
TP_PROTO(int nbytes, unsigned long IP),