nautilus: mon/OSDMonitor: Use generic priority cache tuner for mon caches

[sseshasa]

https://tracker.ceph.com/issues/41238

[smithfarm]

Build failure:

[ 38%] Building CXX object src/rgw/CMakeFiles/rgw_common.dir/rgw_keystone.cc.o
In file included from /home/jenkins-build/build/workspace/ceph-pull-requests/src/mon/MDSMonitor.cc:23:0:
/home/jenkins-build/build/workspace/ceph-pull-requests/src/mon/OSDMonitor.h:231:34: error: 'Manager' is not a member of 'PriorityCache'
   std::shared_ptr<PriorityCache::Manager> pcm = nullptr;
                                  ^~~~~~~
/home/jenkins-build/build/workspace/ceph-pull-requests/src/mon/OSDMonitor.h:231:41: error: template argument 1 is invalid
   std::shared_ptr<PriorityCache::Manager> pcm = nullptr;
                                         ^
/home/jenkins-build/build/workspace/ceph-pull-requests/src/mon/OSDMonitor.h:231:49: error: cannot convert 'std::nullptr_t' to 'int' in initialization
   std::shared_ptr<PriorityCache::Manager> pcm = nullptr;
                                                 ^~~~~~~
src/mon/CMakeFiles/mon.dir/build.make:206: recipe for target 'src/mon/CMakeFiles/mon.dir/MDSMonitor.cc.o' failed
make[3]: *** [src/mon/CMakeFiles/mon.dir/MDSMonitor.cc.o] Error 1

[sseshasa]

This has a dependency on the latest changes of priority cache manager being available in nautilus. @markhpc @neha-ojha is there a corresponding backport created for #27381 and other subsequent improvements to pcm? I can add them as dependencies to this PR on the tracker ticket.

[neha-ojha]

This has a dependency on the latest changes of priority cache manager being available in nautilus. @markhpc @neha-ojha is there a corresponding backport created for #27381 and other subsequent improvements to pcm? I can add them as dependencies to this PR on the tracker ticket.

I don't think so. Yeah, adding references to master PRs/commits should be fine.

[sseshasa]

I will open a new branch to track this backport PR as there a lot more commits to be picked from master. Closing this PR.