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- Split p_flag up into two fields. p_flag keeps most of the previous flags
and is protected by the proc lock. p_sflag is protected by sched_lock and holds the following flags: PS_INMEM, PS_OWEUPC, PS_PROFIL, PS_SINTR, PS_TIMEOUT, PS_ALRMPEND, PS_PROFPEND, PS_CVWAITQ, PS_SWAPINREQ, and PS_SWAPPING. - p_klist is definitely locked now by the proc lock. - p_runtime, p_[usi]u are locked by sched_lock. - Add a new P_KTHREAD flag set for kernel threads created via kthread_create(9). - STOPEVENT() only needs the proc lock, it does not need Giant. - faultin() already checks PS_INMEM, so simplify the check in PHOLD() so that we only need to grab the proc lock and let faultin() perform the PS_INMEM check. - Add a prototype for zpfind(). - Add prototypes for the new fork_exit() and fork_return() MI functions that manage the fork return path. - Add a prototype for the MD function userret() so that it can be called from fork_return(). - Add needed include of <machine/frame.h> in the kernel.
This commit is contained in:
John Baldwin
parent
0e2fa3bb50
commit
7eea49bf11
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=71520
@ -48,7 +48,9 @@
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#include <sys/queue.h>
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#include <sys/rtprio.h> /* For struct rtprio. */
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#include <sys/signal.h>
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#ifndef _KERNEL
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#ifdef _KERNEL
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#include <machine/frame.h>
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#else
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#include <sys/time.h> /* For structs itimerval, timeval. */
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#endif
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#include <sys/ucred.h>
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@ -158,7 +160,8 @@ struct proc {
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#define p_ucred p_cred->pc_ucred
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#define p_rlimit p_limit->pl_rlimit
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int p_flag; /* (c/j) P_* flags. */
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int p_flag; /* (c) P_* flags. */
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int p_sflag; /* (j) PS_* flags. */
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int p_intr_nesting_level; /* (n) Interrupt recursion. */
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char p_stat; /* (j) S* process status. */
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char p_pad1[3];
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@ -189,10 +192,10 @@ struct proc {
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struct callout p_itcallout; /* (h) Interval timer callout. */
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struct itimerval p_realtimer; /* (h?/k?) Alarm timer. */
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u_int64_t p_runtime; /* (c) Real time in microsec. */
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u_int64_t p_uu; /* (c) Previous user time in microsec. */
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u_int64_t p_su; /* (c) Previous system time in microsec. */
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u_int64_t p_iu; /* (c) Previous interrupt time in microsec. */
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u_int64_t p_runtime; /* (j) Real time in microsec. */
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u_int64_t p_uu; /* (j) Previous user time in microsec. */
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u_int64_t p_su; /* (j) Previous system time in microsec. */
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u_int64_t p_iu; /* (j) Previous interrupt time in microsec. */
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u_int64_t p_uticks; /* (j) Statclock hits in user mode. */
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u_int64_t p_sticks; /* (j) Statclock hits in system mode. */
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u_int64_t p_iticks; /* (j) Statclock hits processing intr. */
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@ -223,7 +226,7 @@ struct proc {
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sigset_t p_oldsigmask; /* (c) Saved mask from before sigpause. */
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int p_sig; /* (n) For core dump/debugger XXX. */
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u_long p_code; /* (n) For core dump/debugger XXX. */
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struct klist p_klist; /* (c?) Knotes attached to this process. */
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struct klist p_klist; /* (c) Knotes attached to this process. */
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LIST_HEAD(, mtx) p_heldmtx; /* (j) For debugging code. */
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struct mtx *p_blocked; /* (j) Mutex process is blocked on. */
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const char *p_mtxname; /* (j) Name of mutex blocked on. */
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@ -242,7 +245,7 @@ struct proc {
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u_char p_priority; /* (j) Process priority. */
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u_char p_usrpri; /* (j) User priority based on p_cpu and p_nice. */
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u_char p_nativepri; /* (j) Priority before propagation. */
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char p_nice; /* (j/k?) Process "nice" value. */
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char p_nice; /* (j?/k?) Process "nice" value. */
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char p_comm[MAXCOMLEN + 1]; /* (b) Process name. */
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struct pgrp *p_pgrp; /* (e?/c?) Pointer to process group. */
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@ -284,27 +287,19 @@ struct proc {
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/* These flags are kept in p_flag. */
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#define P_ADVLOCK 0x00001 /* Process may hold a POSIX advisory lock. */
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#define P_CONTROLT 0x00002 /* Has a controlling terminal. */
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#define P_INMEM 0x00004 /* Loaded into memory. */
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#define P_KTHREAD 0x00004 /* Kernel thread. */
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#define P_NOLOAD 0x00008 /* Ignore during load avg calculations. */
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#define P_PPWAIT 0x00010 /* Parent is waiting for child to exec/exit. */
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#define P_PROFIL 0x00020 /* Has started profiling. */
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#define P_SELECT 0x00040 /* Selecting; wakeup/waiting danger. */
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#define P_SINTR 0x00080 /* Sleep is interruptible. */
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#define P_SUGID 0x00100 /* Had set id privileges since last exec. */
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#define P_SYSTEM 0x00200 /* System proc: no sigs, stats or swapping. */
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#define P_TIMEOUT 0x00400 /* Timing out during sleep. */
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#define P_TRACED 0x00800 /* Debugged process being traced. */
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#define P_WAITED 0x01000 /* Debugging process has waited for child. */
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#define P_WEXIT 0x02000 /* Working on exiting. */
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#define P_EXEC 0x04000 /* Process called exec. */
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#define P_ALRMPEND 0x08000 /* Pending SIGVTALRM needs to be posted. */
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#define P_PROFPEND 0x10000 /* Pending SIGPROF needs to be posted. */
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/* Should be moved to machine-dependent areas. */
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#define P_OWEUPC 0x20000 /* Owe process an addupc() call at next ast. */
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#define P_SWAPPING 0x40000 /* Process is being swapped. */
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#define P_SWAPINREQ 0x80000 /* Swapin request due to wakeup. */
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#define P_BUFEXHAUST 0x100000 /* Dirty buffers flush is in progress. */
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#define P_COWINPROGRESS 0x400000 /* Snapshot copy-on-write in progress. */
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@ -314,7 +309,17 @@ struct proc {
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#define P_OLDMASK 0x2000000 /* Need to restore mask after suspend. */
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#define P_ALTSTACK 0x4000000 /* Have alternate signal stack. */
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#define P_CVWAITQ 0x8000000 /* proces is on a cv_waitq (not slpq) */
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/* These flags are kept in p_sflag and are protected with sched_lock. */
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#define PS_INMEM 0x00001 /* Loaded into memory. */
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#define PS_OWEUPC 0x00002 /* Owe process an addupc() call at next ast. */
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#define PS_PROFIL 0x00004 /* Has started profiling. */
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#define PS_SINTR 0x00008 /* Sleep is interruptible. */
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#define PS_TIMEOUT 0x00010 /* Timing out during sleep. */
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#define PS_ALRMPEND 0x00020 /* Pending SIGVTALRM needs to be posted. */
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#define PS_PROFPEND 0x00040 /* Pending SIGPROF needs to be posted. */
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#define PS_CVWAITQ 0x00080 /* Proces is on a cv_waitq (not slpq). */
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#define PS_SWAPINREQ 0x00100 /* Swapin request due to wakeup. */
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#define PS_SWAPPING 0x00200 /* Process is being swapped. */
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#define P_MAGIC 0xbeefface
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@ -399,11 +404,11 @@ sigonstack(size_t sp)
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/* STOPEVENT() is MP safe. */
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#define STOPEVENT(p, e, v) do { \
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PROC_LOCK(p); \
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if ((p)->p_stops & (e)) { \
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mtx_enter(&Giant, MTX_DEF); \
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stopevent((p), (e), (v)); \
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mtx_exit(&Giant, MTX_DEF); \
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} \
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PROC_UNLOCK(p); \
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} while (0)
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/* Lock and unlock a process. */
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@ -432,12 +437,11 @@ sigonstack(size_t sp)
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/* Hold process U-area in memory, normally for ptrace/procfs work. */
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#define PHOLD(p) do { \
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PROC_LOCK(p); \
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if ((p)->p_lock++ == 0 && ((p)->p_flag & P_INMEM) == 0) { \
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PROC_UNLOCK(p); \
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if ((p)->p_lock++ == 0) \
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faultin(p); \
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} else \
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PROC_UNLOCK(p); \
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} while (0)
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#define PRELE(p) do { \
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PROC_LOCK(p); \
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(--(p)->p_lock); \
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@ -495,12 +499,16 @@ struct mtx;
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struct proc *pfind __P((pid_t)); /* Find process by id. */
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struct pgrp *pgfind __P((pid_t)); /* Find process group by id. */
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struct proc *zpfind __P((pid_t)); /* Find zombie process by id. */
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struct proc *chooseproc __P((void));
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int enterpgrp __P((struct proc *p, pid_t pgid, int mksess));
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void faultin __P((struct proc *p));
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void fixjobc __P((struct proc *p, struct pgrp *pgrp, int entering));
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int fork1 __P((struct proc *, int, struct proc **));
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void fork_exit __P((void *(void *, struct trapframe *), void *,
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struct trapframe));
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void fork_return __P((struct proc *, struct trapframe *));
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int inferior __P((struct proc *p));
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int leavepgrp __P((struct proc *p));
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void mi_switch __P((void));
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@ -524,6 +532,7 @@ void cpu_switch __P((void));
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void cpu_throw __P((void)) __dead2;
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void unsleep __P((struct proc *));
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void updatepri __P((struct proc *));
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void userret __P((struct proc *, struct trapframe *, u_quad_t));
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void maybe_resched __P((struct proc *));
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void cpu_exit __P((struct proc *)) __dead2;
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