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lp:~vlad-lesin/percona-server/5.6-logical-readahead

Created by Vlad Lesin and last modified
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578. By Vlad Lesin

Add mysqldump support for logical read ahead

Summary:
Adds options to mysqldump:
 --lra-size=X
 --lra-sleep=X
 --lra-n-node-recs-before-sleep=X

These just inject SET statements to set these session variables.

The original implementation is here:
https://github.com/facebook/mysql-5.6/commit/f69a4ea522bce24e4cdcc7696d5fad29587cf87a

577. By Vlad Lesin

When the session variable innodb_lra_size is set to N, we issue async
read requests for the next M logical pages where the total size of the M
pages on disk is N megabytes. The max allowed value of innodb_lra_size
is is 16384 which corresponds to prefetching 16GB of data. We may choose
to use smaller values in production.

The original implementation can be found here:
https://github.com/facebook/mysql-5.6/commit/f8e361952612d00979f7cf744f487e48b15cb5a6

This implementation does not contain code for flashcahe.

576. By Vlad Lesin

Merge aio page read requests

Summary:
Tries to submit multiple aio page read requests together to improve read
performance.

The original code and description can be found here:
https://github.com/facebook/mysql-5.6/commit/f9d1a5332eb2c82c028638d3b93b5a3592a69ffa

The difference between this and the original implementation is that fil_io()
macros invokes _fil_io() function with enabled io's buffering by default in
the original implementation, it can cause the errors connected with waiting
io finishing just after fil_io() invocation.

For example log_archive_do() waits io's finishing on log_sys->archive_lock
mutex, but the mutex is not being unlocked as io's were buffered and
uncommited and io_handler_thread() does not process io's completion in
fil_aio_wait(). Potentially there can be the same errors so io's buffering
is disabled by default and will be enabled only for logical readahead code.

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