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    SubjectRe: [PATCH v2 0/1] block: Add test-iosched scheduler
    On Sat, Jun 9, 2012 at 8:24 PM,  <> wrote:
    >> On Thu, Jun 7, 2012 at 1:14 AM, Maya Erez <> wrote:
    >>> The test scheduler allows testing a block device by dispatching
    >>> specific requests according to the test case and declare PASS/FAIL
    >>> according to the requests completion error code
    >> I can't get the point. Isn't this possible purely from userspace using
    >> IOCTLs ?
    >> Even otherwise, requiring to modify the scheduler for each test case
    >> is definitely not scalable.
    > The main benefit of the test-iosched is the ability to determine the
    > timing of each request that is being dispatched and to put on hold the
    > real FS requests so that they won't affect the tests scenario.

    Then a potentially long running test can block any useful work that can
    be done on the device. no-op is not the right scheduler for the example
    you mentioned (eMMC), so such device has to be mounted only for the
    purpose of running the tests.
    So using standard noop + debugfs would be sufficient for 99% of the cases ?

    > It also allows each block device to determine pass/fail result taking into
    > account the expected behavior and the actual result.

    > The scheduler doesn't have to be changed per tests case. What made you
    > think it should be?
    Err.. I misread this section of documentation. I read is as sysfs
    instead of debugfs.
    My mistake..
    +Each test is exposed via debugfs and can be triggered by writing to
    +the debugfs file. In order to add a new test one should expose a new debugfs
    +file for the new test.

    > Currently we use the test-iosched to test the eMMC4.5 features (such as
    > BKOPs, packed commands and sanitize). I hope that after we will release
    > the tests later this week it will be clearer.
    Sure. It'd be useful.

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      Last update: 2012-06-11 18:21    [W:0.025 / U:6.352 seconds]
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