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Replace ktr_buffer pointer in struct ktr_header with a ktr_unused

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intptr_t.  The buffer length needs to be written to disk as part
of the trace log, but the kernel pointer for the buffer does not.
Add a new ktr_buffer pointer to the kernel-only ktrace request
structure to hold that pointer.  This frees up an integer in the
ktrace record format that can be used to hold the threadid,
although older ktrace files will have a garbage ktr_buffer field
(or more accurately, a kernel pointer value).

MFC after:		2 weeks
Space requested by:	davidxu
This commit is contained in:
rwatson 2005-11-01 12:36:19 +00:00
parent 4db4b8a4b9
commit efbbbf570d
2 changed files with 12 additions and 10 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

20
sys/kern/kern_ktrace.c
View File

@ -64,6 +64,7 @@ static MALLOC_DEFINE(M_KTRACE, "KTRACE", "KTRACE");
struct ktr_request {
struct ktr_header ktr_header;
void *ktr_buffer;
struct ucred *ktr_cred;
struct vnode *ktr_vp;
union {
@ -237,7 +238,8 @@ ktr_getrequest(int type)
microtime(&req->ktr_header.ktr_time);
req->ktr_header.ktr_pid = p->p_pid;
bcopy(p->p_comm, req->ktr_header.ktr_comm, MAXCOMLEN + 1);
req->ktr_header.ktr_buffer = NULL;
req->ktr_header.ktr_unused = 0;
req->ktr_buffer = NULL;
req->ktr_header.ktr_len = 0;
} else {
p->p_traceflag |= KTRFAC_DROP;
@ -272,8 +274,8 @@ ktr_freerequest(struct ktr_request *req)
vrele(req->ktr_vp);
mtx_unlock(&Giant);
}
if (req->ktr_header.ktr_buffer != NULL)
free(req->ktr_header.ktr_buffer, M_KTRACE);
if (req->ktr_buffer != NULL)
free(req->ktr_buffer, M_KTRACE);
mtx_lock(&ktrace_mtx);
STAILQ_INSERT_HEAD(&ktr_free, req, ktr_list);
mtx_unlock(&ktrace_mtx);
@ -340,7 +342,7 @@ ktrsyscall(code, narg, args)
ktp->ktr_narg = narg;
if (buflen > 0) {
req->ktr_header.ktr_len = buflen;
req->ktr_header.ktr_buffer = buf;
req->ktr_buffer = buf;
}
ktr_submitrequest(req);
}
@ -387,7 +389,7 @@ ktrnamei(path)
}
if (namelen > 0) {
req->ktr_header.ktr_len = namelen;
req->ktr_header.ktr_buffer = buf;
req->ktr_buffer = buf;
}
ktr_submitrequest(req);
}
@ -436,7 +438,7 @@ ktrgenio(fd, rw, uio, error)
ktg->ktr_fd = fd;
ktg->ktr_rw = rw;
req->ktr_header.ktr_len = datalen;
req->ktr_header.ktr_buffer = buf;
req->ktr_buffer = buf;
ktr_submitrequest(req);
}
@ -684,7 +686,7 @@ utrace(td, uap)
free(cp, M_KTRACE);
return (ENOMEM);
}
req->ktr_header.ktr_buffer = cp;
req->ktr_buffer = cp;
req->ktr_header.ktr_len = uap->len;
ktr_submitrequest(req);
return (0);
@ -827,8 +829,8 @@ ktr_writerequest(struct ktr_request *req)
kth->ktr_len += datalen;
}
if (buflen != 0) {
KASSERT(kth->ktr_buffer != NULL, ("ktrace: nothing to write"));
aiov[auio.uio_iovcnt].iov_base = kth->ktr_buffer;
KASSERT(req->ktr_buffer != NULL, ("ktrace: nothing to write"));
aiov[auio.uio_iovcnt].iov_base = req->ktr_buffer;
aiov[auio.uio_iovcnt].iov_len = buflen;
auio.uio_resid += buflen;
auio.uio_iovcnt++;

2
sys/sys/ktrace.h
View File

@ -54,7 +54,7 @@ struct ktr_header {
pid_t ktr_pid; /* process id */
char ktr_comm[MAXCOMLEN+1]; /* command name */
struct timeval ktr_time; /* timestamp */
void *ktr_buffer;
intptr_t ktr_unused; /* was ktr_buffer */
};
/*