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| author | Eric Biggers <ebiggers@google.com> | 2022-11-13 16:12:33 -0800 |
|---|---|---|
| committer | Herbert Xu <herbert@gondor.apana.org.au> | 2022-11-25 17:39:18 +0800 |
| commit | a7008584ab19d2df05caa95634cd72bc41f4cad3 (patch) | |
| tree | b6333243c1509ada70aa37d87e1067d403c04c29 /crypto/api.c | |
| parent | 719c547c6551d48ceb71c1a7ab6ffb96d218551f (diff) | |
| download | linux-a7008584ab19d2df05caa95634cd72bc41f4cad3.tar.bz2 | |
crypto: api - optimize algorithm registration when self-tests disabled
Currently, registering an algorithm with the crypto API always causes a
notification to be posted to the "cryptomgr", which then creates a
kthread to self-test the algorithm. However, if self-tests are disabled
in the kconfig (as is the default option), then this kthread just
notifies waiters that the algorithm has been tested, then exits.
This causes a significant amount of overhead, especially in the kthread
creation and destruction, which is not necessary at all. For example,
in a quick test I found that booting a "minimum" x86_64 kernel with all
the crypto options enabled (except for the self-tests) takes about 400ms
until PID 1 can start. Of that, a full 13ms is spent just doing this
pointless dance, involving a kthread being created, run, and destroyed
over 200 times. That's over 3% of the entire kernel start time.
Fix this by just skipping the creation of the test larval and the
posting of the registration notification entirely, when self-tests are
disabled.
Signed-off-by: Eric Biggers <ebiggers@google.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>
Diffstat (limited to 'crypto/api.c')
| -rw-r--r-- | crypto/api.c | 3 |
1 files changed, 0 insertions, 3 deletions
diff --git a/crypto/api.c b/crypto/api.c index 64f2d365a8e9..52ce10a35366 100644 --- a/crypto/api.c +++ b/crypto/api.c @@ -172,9 +172,6 @@ void crypto_wait_for_test(struct crypto_larval *larval) err = wait_for_completion_killable(&larval->completion); WARN_ON(err); - if (!err) - crypto_notify(CRYPTO_MSG_ALG_LOADED, larval); - out: crypto_larval_kill(&larval->alg); } |