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| author | Phil Sutter <phil@nwl.cc> | 2015-11-20 18:17:20 +0100 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2015-11-23 12:36:08 -0500 |
| commit | d662e037fc88b187494a95b5bc19b3c0e9b9ea36 (patch) | |
| tree | 9dff531c5029aae25ba4d03faa9610c1d16b6b57 | |
| parent | 95e435afefe98b8ef6ae8b764879a064cd931a5c (diff) | |
| download | lwn-d662e037fc88b187494a95b5bc19b3c0e9b9ea36.tar.gz lwn-d662e037fc88b187494a95b5bc19b3c0e9b9ea36.zip | |
rhashtable-test: allow to retry even if -ENOMEM was returned
This is rather a hack to expose the current issue with rhashtable to
under high pressure sometimes return -ENOMEM even though system memory
is not exhausted and a consecutive insert may succeed.
Signed-off-by: Phil Sutter <phil@nwl.cc>
Signed-off-by: David S. Miller <davem@davemloft.net>
| -rw-r--r-- | lib/test_rhashtable.c | 14 |
1 files changed, 13 insertions, 1 deletions
diff --git a/lib/test_rhashtable.c b/lib/test_rhashtable.c index 6fa77b3f0e80..270bf7289b1e 100644 --- a/lib/test_rhashtable.c +++ b/lib/test_rhashtable.c @@ -52,6 +52,10 @@ static int tcount = 10; module_param(tcount, int, 0); MODULE_PARM_DESC(tcount, "Number of threads to spawn (default: 10)"); +static bool enomem_retry = false; +module_param(enomem_retry, bool, 0); +MODULE_PARM_DESC(enomem_retry, "Retry insert even if -ENOMEM was returned (default: off)"); + struct test_obj { int value; struct rhash_head node; @@ -79,14 +83,22 @@ static struct semaphore startup_sem = __SEMAPHORE_INITIALIZER(startup_sem, 0); static int insert_retry(struct rhashtable *ht, struct rhash_head *obj, const struct rhashtable_params params) { - int err, retries = -1; + int err, retries = -1, enomem_retries = 0; do { retries++; cond_resched(); err = rhashtable_insert_fast(ht, obj, params); + if (err == -ENOMEM && enomem_retry) { + enomem_retries++; + err = -EBUSY; + } } while (err == -EBUSY); + if (enomem_retries) + pr_info(" %u insertions retried after -ENOMEM\n", + enomem_retries); + return err ? : retries; } |