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| author | Beld Zhang <beldzhang@gmail.com> | 2021-11-02 12:32:08 -0600 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2021-11-02 12:33:35 -0600 |
| commit | 71c9ce27bb57c59d8d7f5298e730c8096eef3d1f (patch) | |
| tree | 59d31c9a2da46dcd517237c73dca44575d9a3fe7 /fs/io-wq.c | |
| parent | 9881024aab8094a53756c7aee42564306c8e3580 (diff) | |
| download | linux-71c9ce27bb57c59d8d7f5298e730c8096eef3d1f.tar.gz | |
io-wq: fix max-workers not correctly set on multi-node system
In io-wq.c:io_wq_max_workers(), new_count[] was changed right after each
node's value was set. This caused the following node getting the setting
of the previous one.
Returned values are copied from node 0.
Fixes: 2e480058ddc2 ("io-wq: provide a way to limit max number of workers")
Signed-off-by: Beld Zhang <beldzhang@gmail.com>
[axboe: minor fixups]
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io-wq.c')
| -rw-r--r-- | fs/io-wq.c | 16 |
1 files changed, 13 insertions, 3 deletions
diff --git a/fs/io-wq.c b/fs/io-wq.c index c51691262208..afd955d53db9 100644 --- a/fs/io-wq.c +++ b/fs/io-wq.c @@ -1308,7 +1308,9 @@ int io_wq_cpu_affinity(struct io_wq *wq, cpumask_var_t mask) */ int io_wq_max_workers(struct io_wq *wq, int *new_count) { - int i, node, prev = 0; + int prev[IO_WQ_ACCT_NR]; + bool first_node = true; + int i, node; BUILD_BUG_ON((int) IO_WQ_ACCT_BOUND != (int) IO_WQ_BOUND); BUILD_BUG_ON((int) IO_WQ_ACCT_UNBOUND != (int) IO_WQ_UNBOUND); @@ -1319,6 +1321,9 @@ int io_wq_max_workers(struct io_wq *wq, int *new_count) new_count[i] = task_rlimit(current, RLIMIT_NPROC); } + for (i = 0; i < IO_WQ_ACCT_NR; i++) + prev[i] = 0; + rcu_read_lock(); for_each_node(node) { struct io_wqe *wqe = wq->wqes[node]; @@ -1327,14 +1332,19 @@ int io_wq_max_workers(struct io_wq *wq, int *new_count) raw_spin_lock(&wqe->lock); for (i = 0; i < IO_WQ_ACCT_NR; i++) { acct = &wqe->acct[i]; - prev = max_t(int, acct->max_workers, prev); + if (first_node) + prev[i] = max_t(int, acct->max_workers, prev[i]); if (new_count[i]) acct->max_workers = new_count[i]; - new_count[i] = prev; } raw_spin_unlock(&wqe->lock); + first_node = false; } rcu_read_unlock(); + + for (i = 0; i < IO_WQ_ACCT_NR; i++) + new_count[i] = prev[i]; + return 0; } |