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Revert "Pre-allocate vdev I/O buffers"

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Commit 86dd0fd added preallocated I/O buffers.  This is no longer
required after the recent kmem changes designed to make our memory
allocation interfaces behave more like those found on Illumos.  A
deadlock in this situation is no longer possible.

However, these allocations still have the potential to be expensive.
So a potential future optimization might be to perform then KM_NOSLEEP
so that they either succeed of fail quicky.  Either case is acceptable
here because we can safely abort the aggregation.

Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
This commit is contained in:
Brian Behlendorf
2014-12-12 16:40:21 -08:00
parent 60e1eda929
commit 285b29d959
4 changed files with 2 additions and 72 deletions
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include/sys/zio.h
-2
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@@ -522,8 +522,6 @@ extern void *zio_buf_alloc(size_t size);
extern void zio_buf_free(void *buf, size_t size);
extern void *zio_data_buf_alloc(size_t size);
extern void zio_data_buf_free(void *buf, size_t size);
extern void *zio_vdev_alloc(void);
extern void zio_vdev_free(void *buf);
extern void zio_resubmit_stage_async(void *);