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authorGeorge Wilson <[email protected]>2013-05-02 16:36:32 -0700
committerBrian Behlendorf <[email protected]>2013-05-03 16:53:52 -0700
commit5853fe790d1df58c5dd85ea52c5e165b6d43013c (patch)
treea17c4c13e3dba02ef842b408b9b2dfc76387422c /module/zfs/space_map.c
parent5165473737e488447edfe25209c68704e08b3a2d (diff)
Illumos #3306, #3321
3306 zdb should be able to issue reads in parallel 3321 'zpool reopen' command should be documented in the man page and help Reviewed by: Adam Leventhal <[email protected]> Reviewed by: Matt Ahrens <[email protected]> Reviewed by: Christopher Siden <[email protected]> Approved by: Garrett D'Amore <[email protected]> References: illumos/illumos-gate@31d7e8fa33fae995f558673adb22641b5aa8b6e1 https://www.illumos.org/issues/3306 https://www.illumos.org/issues/3321 The vdev_file.c implementation in this patch diverges significantly from the upstream version. For consistenty with the vdev_disk.c code the upstream version leverages the Illumos bio interfaces. This makes sense for Illumos but not for ZoL for two reasons. 1) The vdev_disk.c code in ZoL has been rewritten to use the Linux block device interfaces which differ significantly from those in Illumos. Therefore, updating the vdev_file.c to use the Illumos interfaces doesn't get you consistency with vdev_disk.c. 2) Using the upstream patch as is would requiring implementing compatibility code for those Solaris block device interfaces in user and kernel space. That additional complexity could lead to confusion and doesn't buy us anything. For these reasons I've opted to simply move the existing vn_rdwr() as is in to the taskq function. This has the advantage of being low risk and easy to understand. Moving the vn_rdwr() function in to its own taskq thread also neatly avoids the possibility of a stack overflow. Finally, because of the additional work which is being handled by the free taskq the number of threads has been increased. The thread count under Illumos defaults to 100 but was decreased to 2 in commit 08d08e due to contention. We increase it to 8 until the contention can be address by porting Illumos #3581. Ported-by: Brian Behlendorf <[email protected]> Closes #1354
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