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Added tracebd.py, a script for rendering block device operations

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Based on a handful of local hacky variations, this sort of trace
rendering is surprisingly useful for getting an understanding of how
different filesystem operations interact with the underlying
block-device.

At some point it would probably be good to reimplement this in a
compiled language. Parsing and tracking the trace output quickly
becomes a bottleneck with the amount of trace output the tests
generate.

Note also that since tracebd.py run on trace output, it can also be
used to debug logged block-device operations post-run.
This commit is contained in:
Christopher Haster
2022-09-02 03:08:28 -05:00
parent c9a6e3a95b
commit 91200e6678
7 changed files with 878 additions and 80 deletions
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bd/lfs_testbd.h
+5 -5
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@@ -58,8 +58,8 @@ typedef uint32_t lfs_testbd_powercycles_t;
typedef int32_t lfs_testbd_spowercycles_t;
// Type for delays in nanoseconds
typedef uint64_t lfs_testbd_delay_t;
typedef int64_t lfs_testbd_sdelay_t;
typedef uint64_t lfs_testbd_sleep_t;
typedef int64_t lfs_testbd_ssleep_t;
// testbd config, this is required for testing
struct lfs_testbd_config {
@@ -100,15 +100,15 @@ struct lfs_testbd_config {
// Artificial delay in nanoseconds, there is no purpose for this other
// than slowing down the simulation.
lfs_testbd_delay_t read_delay;
lfs_testbd_sleep_t read_sleep;
// Artificial delay in nanoseconds, there is no purpose for this other
// than slowing down the simulation.
lfs_testbd_delay_t prog_delay;
lfs_testbd_sleep_t prog_sleep;
// Artificial delay in nanoseconds, there is no purpose for this other
// than slowing down the simulation.
lfs_testbd_delay_t erase_delay;
lfs_testbd_sleep_t erase_sleep;
};
// A reference counted block