Date: Sat, 13 Jun 2026 01:03:56 +0000 From: Konstantin Belousov <kib@FreeBSD.org> To: src-committers@FreeBSD.org, dev-commits-src-all@FreeBSD.org, dev-commits-src-branches@FreeBSD.org Subject: git: 06dae2185fc2 - stable/15 - proc: add tree ref count Message-ID: <6a2cac7c.1f6ff.6cad4641@gitrepo.freebsd.org>
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The branch stable/15 has been updated by kib: URL: https://cgit.FreeBSD.org/src/commit/?id=06dae2185fc249ef30f13c343cc7139f20739671 commit 06dae2185fc249ef30f13c343cc7139f20739671 Author: Konstantin Belousov <kib@FreeBSD.org> AuthorDate: 2026-06-06 18:02:29 +0000 Commit: Konstantin Belousov <kib@FreeBSD.org> CommitDate: 2026-06-13 00:58:37 +0000 proc: add tree ref count (cherry picked from commit 85a65e3930924429903e09832d177f8aa09dfb47) --- sys/kern/kern_exit.c | 2 +- sys/kern/kern_fork.c | 3 ++- sys/kern/kern_proc.c | 1 + sys/sys/proc.h | 7 +++++++ 4 files changed, 11 insertions(+), 2 deletions(-) diff --git a/sys/kern/kern_exit.c b/sys/kern/kern_exit.c index 63e46dcf46f7..2f94386c9101 100644 --- a/sys/kern/kern_exit.c +++ b/sys/kern/kern_exit.c @@ -1107,7 +1107,7 @@ proc_reap(struct thread *td, struct proc *p, int *status, int options) KASSERT(FIRST_THREAD_IN_PROC(p), ("proc_reap: no residual thread!")); - uma_zfree(proc_zone, p); + PROC_TREE_UNREF(p); atomic_add_int(&nprocs, -1); } diff --git a/sys/kern/kern_fork.c b/sys/kern/kern_fork.c index edbb61e0e68b..83a3162d8cfb 100644 --- a/sys/kern/kern_fork.c +++ b/sys/kern/kern_fork.c @@ -1058,6 +1058,7 @@ fork1(struct thread *td, struct fork_req *fr) pages = kstack_pages; /* Allocate new proc. */ newproc = uma_zalloc(proc_zone, M_WAITOK); + PROC_TREE_REF(newproc); td2 = FIRST_THREAD_IN_PROC(newproc); if (td2 == NULL) { td2 = thread_alloc(pages); @@ -1138,7 +1139,7 @@ fail1: fail2: if (vm2 != NULL) vmspace_free(vm2); - uma_zfree(proc_zone, newproc); + PROC_TREE_UNREF(newproc); if ((flags & RFPROCDESC) != 0 && fp_procdesc != NULL) { fdclose(td, fp_procdesc, *fr->fr_pd_fd); fdrop(fp_procdesc, td); diff --git a/sys/kern/kern_proc.c b/sys/kern/kern_proc.c index 758f54c540ab..71d5faf3c050 100644 --- a/sys/kern/kern_proc.c +++ b/sys/kern/kern_proc.c @@ -281,6 +281,7 @@ proc_init(void *mem, int size, int flags) p->p_pgrp = NULL; TAILQ_INIT(&p->p_kqtim_stop); STAILQ_INIT(&p->p_ktr); + refcount_init(&p->p_tree_refcnt, 0); return (0); } diff --git a/sys/sys/proc.h b/sys/sys/proc.h index 4ad22d46b5bb..fd5c366ab95d 100644 --- a/sys/sys/proc.h +++ b/sys/sys/proc.h @@ -779,6 +779,7 @@ struct proc { TAILQ_HEAD(, kq_timer_cb_data) p_kqtim_stop; /* (c) */ LIST_ENTRY(proc) p_jaillist; /* (d) Jail process linkage. */ u_int p_asig; /* (c) ASYNCEXIT pending signal. */ + u_int p_tree_refcnt; /* (e) proctree refcount */ }; #define p_session p_pgrp->pg_session @@ -804,6 +805,12 @@ struct proc { #define PROC_PROFUNLOCK(p) mtx_unlock_spin(&(p)->p_profmtx) #define PROC_PROFLOCK_ASSERT(p, type) mtx_assert(&(p)->p_profmtx, (type)) +#define PROC_TREE_REF(p) refcount_acquire(&(p)->p_tree_refcnt) +#define PROC_TREE_UNREF(p) do { \ + if (refcount_release(&(p)->p_tree_refcnt)) \ + uma_zfree(proc_zone, p); \ +} while (0) + /* These flags are kept in p_flag. */ #define P_ADVLOCK 0x00000001 /* Process may hold a POSIX advisory lock. */home | help
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