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Cheng Chang ee50b8d499 Be able to decrease background thread's CPU priority when creating database backup (#6602) 
Summary:
When creating a database backup, the background threads will not only consume IO resources by copying files, but also consuming CPU such as by computing checksums. During peak times, the CPU consumption by the background threads might affect online queries.

This PR makes it possible to decrease CPU priority of these threads when creating a new backup.
Pull Request resolved: https://github.com/facebook/rocksdb/pull/6602

Test Plan: make check

Reviewed By: siying, zhichao-cao

Differential Revision: D20683216

Pulled By: cheng-chang

fbshipit-source-id: 9978b9ed9488e8ce135e90ca083e5b4b7221fd84
2020-03-28 19:07:25 -07:00
..
win Be able to decrease background thread's CPU priority when creating database backup (#6602) 2020-03-28 19:07:25 -07:00
jemalloc_helper.h Apply formatter to recent 200+ commits. (#5830) 2019-09-20 12:04:26 -07:00
likely.h Support pragma once in all header files and cleanup some warnings (#4339) 2018-09-05 18:13:31 -07:00
malloc.h Charge block cache for cache internal usage (#5797) 2019-09-16 15:26:21 -07:00
port_dirent.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
port_example.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
port_posix.cc Be able to decrease background thread's CPU priority when creating database backup (#6602) 2020-03-28 19:07:25 -07:00
port_posix.h Be able to decrease background thread's CPU priority when creating database backup (#6602) 2020-03-28 19:07:25 -07:00
port.h Change RocksDB License 2017-07-15 16:11:23 -07:00
README reverting disastrous MOE commit, returning to r21 2011-04-19 23:11:15 +00:00
stack_trace.cc Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
stack_trace.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
sys_time.h Replace namespace name "rocksdb" with ROCKSDB_NAMESPACE (#6433) 2020-02-20 12:09:57 -08:00
util_logger.h Move some logging related files to logging/ (#5387) 2019-05-31 17:23:59 -07:00
xpress.h Change RocksDB License 2017-07-15 16:11:23 -07:00

README 

This directory contains interfaces and implementations that isolate the
rest of the package from platform details.

Code in the rest of the package includes "port.h" from this directory.
"port.h" in turn includes a platform specific "port_<platform>.h" file
that provides the platform specific implementation.

See port_posix.h for an example of what must be provided in a platform
specific header file.