From: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Phase 6 doesn't implement background mode, which means that it doesn't
run in single-threaded mode with one -b and it doesn't sleep between
calls with multiple -b like every other phase does. It also doesn't
restrict the amount of work per kernel call, which is a key part of
throttling. Wire up the necessary pieces to make it behave like the man
page says it should.
Signed-off-by: Darrick J. Wong <darrick.wong@xxxxxxxxxx>
Reviewed-by: Allison Collins <allison.henderson@xxxxxxxxxx>
---
scrub/read_verify.c | 21 +++++++++++++++++----
1 file changed, 17 insertions(+), 4 deletions(-)
diff --git a/scrub/read_verify.c b/scrub/read_verify.c
index a963a3fd..82605c8c 100644
--- a/scrub/read_verify.c
+++ b/scrub/read_verify.c
@@ -32,7 +32,19 @@
* because that's the biggest SCSI VERIFY(16) we dare to send.
*/
#define RVP_IO_MAX_SIZE (33554432)
-#define RVP_IO_MAX_SECTORS (RVP_IO_MAX_SIZE >> BBSHIFT)
+
+/*
+ * If we're running in the background then we perform IO in 128k chunks
+ * to reduce the load on the IO subsystem.
+ */
+#define RVP_BACKGROUND_IO_MAX_SIZE (131072)
+
+/* What's the real maximum IO size? */
+static inline unsigned int
+rvp_io_max_size(void)
+{
+ return bg_mode > 0 ? RVP_BACKGROUND_IO_MAX_SIZE : RVP_IO_MAX_SIZE;
+}
/* Tolerate 64k holes in adjacent read verify requests. */
#define RVP_IO_BATCH_LOCALITY (65536)
@@ -89,7 +101,7 @@ read_verify_pool_alloc(
*/
if (miniosz % disk->d_lbasize)
return EINVAL;
- if (RVP_IO_MAX_SIZE % miniosz)
+ if (rvp_io_max_size() % miniosz)
return EINVAL;
rvp = calloc(1, sizeof(struct read_verify_pool));
@@ -97,7 +109,7 @@ read_verify_pool_alloc(
return errno;
ret = posix_memalign((void **)&rvp->readbuf, page_size,
- RVP_IO_MAX_SIZE);
+ rvp_io_max_size());
if (ret)
goto out_free;
ret = ptcounter_alloc(verifier_threads, &rvp->verified_bytes);
@@ -181,7 +193,7 @@ read_verify(
if (rvp->runtime_error)
return;
- io_max_size = RVP_IO_MAX_SIZE;
+ io_max_size = rvp_io_max_size();
while (rv->io_length > 0) {
read_error = 0;
@@ -257,6 +269,7 @@ read_verify(
verified += sz;
rv->io_start += sz;
rv->io_length -= sz;
+ background_sleep();
}
free(rv);
