50677bf806
Threads now have numeric priorities with a base priority in the 1-99
range.
Whenever a runnable thread is *not* scheduled, its effective priority
is incremented by 1. This is tracked in Thread::m_extra_priority.
The effective priority of a thread is m_priority + m_extra_priority.
When a runnable thread *is* scheduled, its m_extra_priority is reset to
zero and the effective priority returns to base.
This means that lower-priority threads will always eventually get
scheduled to run, once its effective priority becomes high enough to
exceed the base priority of threads "above" it.
The previous values for ThreadPriority (Low, Normal and High) are now
replaced as follows:
Low -> 10
Normal -> 30
High -> 50
In other words, it will take 20 ticks for a "Low" priority thread to
get to "Normal" effective priority, and another 20 to reach "High".
This is not perfect, and I've used some quite naive data structures,
but I think the mechanism will allow us to build various new and
interesting optimizations, and we can figure out better data structures
later on. :^)
62 lines
1.3 KiB
C++
62 lines
1.3 KiB
C++
#pragma once
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#include <AK/HashMap.h>
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#include <AK/String.h>
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#include <unistd.h>
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struct CThreadStatistics {
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int tid;
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unsigned times_scheduled;
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unsigned ticks;
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unsigned syscall_count;
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unsigned inode_faults;
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unsigned zero_faults;
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unsigned cow_faults;
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unsigned unix_socket_read_bytes;
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unsigned unix_socket_write_bytes;
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unsigned ipv4_socket_read_bytes;
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unsigned ipv4_socket_write_bytes;
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unsigned file_read_bytes;
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unsigned file_write_bytes;
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String state;
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u32 priority;
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u32 effective_priority;
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String name;
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};
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struct CProcessStatistics {
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// Keep this in sync with /proc/all.
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// From the kernel side:
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pid_t pid;
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unsigned pgid;
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unsigned pgp;
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unsigned sid;
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uid_t uid;
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gid_t gid;
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pid_t ppid;
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unsigned nfds;
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String name;
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String tty;
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size_t amount_virtual;
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size_t amount_resident;
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size_t amount_shared;
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size_t amount_dirty_private;
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size_t amount_clean_inode;
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size_t amount_purgeable_volatile;
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size_t amount_purgeable_nonvolatile;
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int icon_id;
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Vector<CThreadStatistics> threads;
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// synthetic
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String username;
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};
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class CProcessStatisticsReader {
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public:
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static HashMap<pid_t, CProcessStatistics> get_all();
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private:
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static String username_from_uid(uid_t);
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static HashMap<uid_t, String> s_usernames;
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};
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