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Add a divisor parameter to twiddle() so that callers can request that output

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only happen on every Nth call.  Update the existing twiddle() calls done in
various IO loops to roughly reflect the relative IO sizes.  That is, tftp
and nfs call twiddle() on every 1K block, ufs on every filesystem block,
so the network calls now use a much larger divisor than disk IO calls.

Also add a new twiddle_divisor() function that allows an application to set
a global divisor that is applied on top of the per-call divisors.  Nothing
calls this yet, but loader(8) will be using it to further throttle the
cursor for slow serial consoles.
This commit is contained in:
Ian Lepore 2014-12-22 20:42:36 +00:00
parent 8757069658
commit 7668336c8e
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=276079
10 changed files with 44 additions and 28 deletions
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8
lib/libstand/cd9660.c
View File

@ -281,7 +281,7 @@ cd9660_open(const char *path, struct open_file *f)
buf = malloc(buf_size = ISO_DEFAULT_BLOCK_SIZE);
vd = buf;
for (bno = 16;; bno++) {
twiddle();
twiddle(1);
rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
ISO_DEFAULT_BLOCK_SIZE, buf, &read);
if (rc)
@ -314,7 +314,7 @@ cd9660_open(const char *path, struct open_file *f)
while (off < dsize) {
if ((off % ISO_DEFAULT_BLOCK_SIZE) == 0) {
twiddle();
twiddle(1);
rc = f->f_dev->dv_strategy
(f->f_devdata, F_READ,
cdb2devb(bno + boff),
@ -374,7 +374,7 @@ cd9660_open(const char *path, struct open_file *f)
/* Check for Rock Ridge since we didn't in the loop above. */
bno = isonum_733(rec.extent) + isonum_711(rec.ext_attr_length);
twiddle();
twiddle(1);
rc = f->f_dev->dv_strategy(f->f_devdata, F_READ, cdb2devb(bno),
ISO_DEFAULT_BLOCK_SIZE, buf, &read);
if (rc)
@ -431,7 +431,7 @@ buf_read_file(struct open_file *f, char **buf_p, size_t *size_p)
if (fp->f_buf == (char *)0)
fp->f_buf = malloc(ISO_DEFAULT_BLOCK_SIZE);
twiddle();
twiddle(16);
rc = f->f_dev->dv_strategy(f->f_devdata, F_READ,
cdb2devb(blkno), ISO_DEFAULT_BLOCK_SIZE, fp->f_buf, &read);
if (rc)

12
lib/libstand/ext2fs.c
View File

@ -353,7 +353,7 @@ ext2fs_open(const char *upath, struct open_file *f)
/* allocate space and read super block */
fs = (struct ext2fs *)malloc(sizeof(*fs));
fp->f_fs = fs;
twiddle();
twiddle(1);
error = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
EXT2_SBLOCK, EXT2_SBSIZE, (char *)fs, &buf_size);
if (error)
@ -395,7 +395,7 @@ ext2fs_open(const char *upath, struct open_file *f)
len = blkgrps * fs->fs_bsize;
fp->f_bg = malloc(len);
twiddle();
twiddle(1);
error = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
EXT2_SBLOCK + EXT2_SBSIZE / DEV_BSIZE, len,
(char *)fp->f_bg, &buf_size);
@ -507,7 +507,7 @@ ext2fs_open(const char *upath, struct open_file *f)
if (error)
goto out;
twiddle();
twiddle(1);
error = (f->f_dev->dv_strategy)(f->f_devdata,
F_READ, fsb_to_db(fs, disk_block),
fs->fs_bsize, buf, &buf_size);
@ -568,7 +568,7 @@ read_inode(ino_t inumber, struct open_file *f)
* Read inode and save it.
*/
buf = malloc(fs->fs_bsize);
twiddle();
twiddle(1);
error = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
ino_to_db(fs, fp->f_bg, inumber), fs->fs_bsize, buf, &rsize);
if (error)
@ -665,7 +665,7 @@ block_map(struct open_file *f, daddr_t file_block, daddr_t *disk_block_p)
if (fp->f_blk[level] == (char *)0)
fp->f_blk[level] =
malloc(fs->fs_bsize);
twiddle();
twiddle(1);
error = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
fsb_to_db(fp->f_fs, ind_block_num), fs->fs_bsize,
fp->f_blk[level], &fp->f_blksize[level]);
@ -723,7 +723,7 @@ buf_read_file(struct open_file *f, char **buf_p, size_t *size_p)
bzero(fp->f_buf, block_size);
fp->f_buf_size = block_size;
} else {
twiddle();
twiddle(4);
error = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
fsb_to_db(fs, disk_block), block_size,
fp->f_buf, &fp->f_buf_size);

2
lib/libstand/nandfs.c
View File

@ -921,7 +921,7 @@ nandfs_bmap_lookup(struct nandfs *fs, struct nandfs_node *node,
return (0);
}
twiddle();
twiddle(1);
NANDFS_DEBUG("calling get_map with %jx\n", ind_block_num);
map = nandfs_get_map(fs, node, ind_block_num, phys);
if (map == NULL)

4
lib/libstand/nfs.c
View File

@ -662,7 +662,7 @@ nfs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
(int)fp->off);
#endif
while ((int)size > 0) {
twiddle();
twiddle(16);
cc = nfs_readdata(fp, fp->off, (void *)addr, size);
/* XXX maybe should retry on certain errors */
if (cc == -1) {
@ -1311,7 +1311,7 @@ nfs_read(struct open_file *f, void *buf, size_t size, size_t *resid)
(int)fp->off);
#endif
while ((int)size > 0) {
twiddle();
twiddle(16);
cc = nfs_readdata(fp, fp->off, (void *)addr, size);
/* XXX maybe should retry on certain errors */
if (cc == -1) {

2
lib/libstand/read.c
View File

@ -77,7 +77,7 @@ read(int fd, void *dest, size_t bcount)
return (-1);
}
if (f->f_flags & F_RAW) {
twiddle();
twiddle(4);
errno = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
btodb(f->f_offset), bcount, dest, &resid);
if (errno)

3
lib/libstand/stand.h
View File

@ -242,7 +242,8 @@ extern int sprintf(char *buf, const char *cfmt, ...) __printflike(2, 3);
extern int snprintf(char *buf, size_t size, const char *cfmt, ...) __printflike(3, 4);
extern void vsprintf(char *buf, const char *cfmt, __va_list);
extern void twiddle(void);
extern void twiddle(u_int callerdiv);
extern void twiddle_divisor(u_int globaldiv);
extern void ngets(char *, int);
#define gets(x) ngets((x), 0)

4
lib/libstand/tftp.c
View File

@ -447,14 +447,12 @@ tftp_read(struct open_file *f, void *addr, size_t size,
size_t *resid /* out */)
{
struct tftp_handle *tftpfile;
static int tc = 0;
tftpfile = (struct tftp_handle *) f->f_fsdata;
while (size > 0) {
int needblock, count;
if (!(tc++ % 16))
twiddle();
twiddle(32);
needblock = tftpfile->off / tftpfile->tftp_blksize + 1;

21
lib/libstand/twiddle.c
View File

@ -42,11 +42,28 @@ __FBSDID("$FreeBSD$");
/* Extra functions from NetBSD standalone printf.c */
static u_int globaldiv;
void
twiddle()
twiddle(u_int callerdiv)
{
static int pos;
static u_int callercnt, globalcnt, pos;
callercnt++;
if (callerdiv > 1 && (callercnt % callerdiv) != 0)
return;
globalcnt++;
if (globaldiv > 1 && (globalcnt % globaldiv) != 0)
return;
putchar("|/-\\"[pos++ & 3]);
putchar('\b');
}
void
twiddle_divisor(u_int gdiv)
{
globaldiv = gdiv;
}

14
lib/libstand/ufs.c
View File

@ -155,7 +155,7 @@ read_inode(inumber, f)
* Read inode and save it.
*/
buf = malloc(fs->fs_bsize);
twiddle();
twiddle(1);
rc = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
fsbtodb(fs, ino_to_fsba(fs, inumber)), fs->fs_bsize,
buf, &rsize);
@ -265,7 +265,7 @@ block_map(f, file_block, disk_block_p)
if (fp->f_blk[level] == (char *)0)
fp->f_blk[level] =
malloc(fs->fs_bsize);
twiddle();
twiddle(1);
rc = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
fsbtodb(fp->f_fs, ind_block_num),
fs->fs_bsize,
@ -346,7 +346,7 @@ buf_write_file(f, buf_p, size_p)
if (fp->f_buf == (char *)0)
fp->f_buf = malloc(fs->fs_bsize);
twiddle();
twiddle(4);
rc = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
fsbtodb(fs, disk_block),
block_size, fp->f_buf, &fp->f_buf_size);
@ -365,7 +365,7 @@ buf_write_file(f, buf_p, size_p)
* Write the block out to storage.
*/
twiddle();
twiddle(4);
rc = (f->f_dev->dv_strategy)(f->f_devdata, F_WRITE,
fsbtodb(fs, disk_block),
block_size, fp->f_buf, &fp->f_buf_size);
@ -406,7 +406,7 @@ buf_read_file(f, buf_p, size_p)
bzero(fp->f_buf, block_size);
fp->f_buf_size = block_size;
} else {
twiddle();
twiddle(4);
rc = (f->f_dev->dv_strategy)(f->f_devdata, F_READ,
fsbtodb(fs, disk_block),
block_size, fp->f_buf, &fp->f_buf_size);
@ -515,7 +515,7 @@ ufs_open(upath, f)
/* allocate space and read super block */
fs = malloc(SBLOCKSIZE);
fp->f_fs = fs;
twiddle();
twiddle(1);
/*
* Try reading the superblock in each of its possible locations.
*/
@ -649,7 +649,7 @@ ufs_open(upath, f)
if (rc)
goto out;
twiddle();
twiddle(1);
rc = (f->f_dev->dv_strategy)(f->f_devdata,
F_READ, fsbtodb(fs, disk_block),
fs->fs_bsize, buf, &buf_size);

2
lib/libstand/write.c
View File

@ -80,7 +80,7 @@ write(fd, dest, bcount)
return (-1);
}
if (f->f_flags & F_RAW) {
twiddle();
twiddle(4);
errno = (f->f_dev->dv_strategy)(f->f_devdata, F_WRITE,
btodb(f->f_offset), bcount, dest, &resid);
if (errno)