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9pfs: Fix severe performance issue of Treaddir requests.

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Merge remote-tracking branch 'remotes/cschoenebeck/tags/pull-9p-20200812' into staging

9pfs: Fix severe performance issue of Treaddir requests.

# gpg: Signature made Wed 12 Aug 2020 11:06:21 BST
# gpg:                using RSA key 96D8D110CF7AF8084F88590134C2B58765A47395
# gpg:                issuer "qemu_oss@crudebyte.com"
# gpg: Good signature from "Christian Schoenebeck <qemu_oss@crudebyte.com>" [unknown]
# gpg: WARNING: This key is not certified with a trusted signature!
# gpg:          There is no indication that the signature belongs to the owner.
# Primary key fingerprint: ECAB 1A45 4014 1413 BA38  4926 30DB 47C3 A012 D5F4
#      Subkey fingerprint: 96D8 D110 CF7A F808 4F88  5901 34C2 B587 65A4 7395

* remotes/cschoenebeck/tags/pull-9p-20200812:
  9pfs: clarify latency of v9fs_co_run_in_worker()
  9pfs: differentiate readdir lock between 9P2000.u vs. 9P2000.L
  9pfs: T_readdir latency optimization
  9pfs: add new function v9fs_co_readdir_many()
  9pfs: split out fs driver core of v9fs_co_readdir()
  9pfs: make v9fs_readdir_response_size() public
  tests/virtio-9p: added split readdir tests

Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Peter Maydell 2020-08-24 16:39:52 +01:00
commit 30aa19446d
5 changed files with 441 additions and 94 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

159
hw/9pfs/9p.c
View File

@ -314,8 +314,8 @@ static V9fsFidState *alloc_fid(V9fsState *s, int32_t fid)
f->next = s->fid_list;
s->fid_list = f;
v9fs_readdir_init(&f->fs.dir);
v9fs_readdir_init(&f->fs_reclaim.dir);
v9fs_readdir_init(s->proto_version, &f->fs.dir);
v9fs_readdir_init(s->proto_version, &f->fs_reclaim.dir);
return f;
}
@ -972,30 +972,6 @@ static int coroutine_fn fid_to_qid(V9fsPDU *pdu, V9fsFidState *fidp,
return 0;
}
static int coroutine_fn dirent_to_qid(V9fsPDU *pdu, V9fsFidState *fidp,
struct dirent *dent, V9fsQID *qidp)
{
struct stat stbuf;
V9fsPath path;
int err;
v9fs_path_init(&path);
err = v9fs_co_name_to_path(pdu, &fidp->path, dent->d_name, &path);
if (err < 0) {
goto out;
}
err = v9fs_co_lstat(pdu, &path, &stbuf);
if (err < 0) {
goto out;
}
err = stat_to_qid(pdu, &stbuf, qidp);
out:
v9fs_path_free(&path);
return err;
}
V9fsPDU *pdu_alloc(V9fsState *s)
{
V9fsPDU *pdu = NULL;
@ -2252,7 +2228,14 @@ static void coroutine_fn v9fs_read(void *opaque)
goto out_nofid;
}
if (fidp->fid_type == P9_FID_DIR) {
if (s->proto_version != V9FS_PROTO_2000U) {
warn_report_once(
"9p: bad client: T_read request on directory only expected "
"with 9P2000.u protocol version"
);
err = -EOPNOTSUPP;
goto out;
}
if (off == 0) {
v9fs_co_rewinddir(pdu, fidp);
}
@ -2313,7 +2296,13 @@ out_nofid:
pdu_complete(pdu, err);
}
static size_t v9fs_readdir_data_size(V9fsString *name)
/**
* Returns size required in Rreaddir response for the passed dirent @p name.
*
* @param name - directory entry's name (i.e. file name, directory name)
* @returns required size in bytes
*/
size_t v9fs_readdir_response_size(V9fsString *name)
{
/*
* Size of each dirent on the wire: size of qid (13) + size of offset (8)
@ -2322,62 +2311,74 @@ static size_t v9fs_readdir_data_size(V9fsString *name)
return 24 + v9fs_string_size(name);
}
static void v9fs_free_dirents(struct V9fsDirEnt *e)
{
struct V9fsDirEnt *next = NULL;
for (; e; e = next) {
next = e->next;
g_free(e->dent);
g_free(e->st);
g_free(e);
}
}
static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp,
int32_t max_count)
off_t offset, int32_t max_count)
{
size_t size;
V9fsQID qid;
V9fsString name;
int len, err = 0;
int32_t count = 0;
off_t saved_dir_pos;
struct dirent *dent;
struct stat *st;
struct V9fsDirEnt *entries = NULL;
/* save the directory position */
saved_dir_pos = v9fs_co_telldir(pdu, fidp);
if (saved_dir_pos < 0) {
return saved_dir_pos;
/*
* inode remapping requires the device id, which in turn might be
* different for different directory entries, so if inode remapping is
* enabled we have to make a full stat for each directory entry
*/
const bool dostat = pdu->s->ctx.export_flags & V9FS_REMAP_INODES;
/*
* Fetch all required directory entries altogether on a background IO
* thread from fs driver. We don't want to do that for each entry
* individually, because hopping between threads (this main IO thread
* and background IO driver thread) would sum up to huge latencies.
*/
count = v9fs_co_readdir_many(pdu, fidp, &entries, offset, max_count,
dostat);
if (count < 0) {
err = count;
count = 0;
goto out;
}
count = 0;
while (1) {
v9fs_readdir_lock(&fidp->fs.dir);
err = v9fs_co_readdir(pdu, fidp, &dent);
if (err || !dent) {
break;
}
v9fs_string_init(&name);
v9fs_string_sprintf(&name, "%s", dent->d_name);
if ((count + v9fs_readdir_data_size(&name)) > max_count) {
v9fs_readdir_unlock(&fidp->fs.dir);
/* Ran out of buffer. Set dir back to old position and return */
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_string_free(&name);
return count;
}
for (struct V9fsDirEnt *e = entries; e; e = e->next) {
dent = e->dent;
if (pdu->s->ctx.export_flags & V9FS_REMAP_INODES) {
/*
* dirent_to_qid() implies expensive stat call for each entry,
* we must do that here though since inode remapping requires
* the device id, which in turn might be different for
* different entries; we cannot make any assumption to avoid
* that here.
*/
err = dirent_to_qid(pdu, fidp, dent, &qid);
st = e->st;
/* e->st should never be NULL, but just to be sure */
if (!st) {
err = -1;
break;
}
/* remap inode */
err = stat_to_qid(pdu, st, &qid);
if (err < 0) {
v9fs_readdir_unlock(&fidp->fs.dir);
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_string_free(&name);
return err;
break;
}
} else {
/*
* Fill up just the path field of qid because the client uses
* only that. To fill the entire qid structure we will have
* to stat each dirent found, which is expensive. For the
* latter reason we don't call dirent_to_qid() here. Only drawback
* latter reason we don't call stat_to_qid() here. Only drawback
* is that no multi-device export detection of stat_to_qid()
* would be done and provided as error to the user here. But
* user would get that error anyway when accessing those
@ -2390,25 +2391,26 @@ static int coroutine_fn v9fs_do_readdir(V9fsPDU *pdu, V9fsFidState *fidp,
qid.version = 0;
}
v9fs_string_init(&name);
v9fs_string_sprintf(&name, "%s", dent->d_name);
/* 11 = 7 + 4 (7 = start offset, 4 = space for storing count) */
len = pdu_marshal(pdu, 11 + count, "Qqbs",
&qid, dent->d_off,
dent->d_type, &name);
v9fs_readdir_unlock(&fidp->fs.dir);
v9fs_string_free(&name);
if (len < 0) {
v9fs_co_seekdir(pdu, fidp, saved_dir_pos);
v9fs_string_free(&name);
return len;
err = len;
break;
}
count += len;
v9fs_string_free(&name);
saved_dir_pos = dent->d_off;
}
v9fs_readdir_unlock(&fidp->fs.dir);
out:
v9fs_free_dirents(entries);
if (err < 0) {
return err;
}
@ -2451,12 +2453,15 @@ static void coroutine_fn v9fs_readdir(void *opaque)
retval = -EINVAL;
goto out;
}
if (initial_offset == 0) {
v9fs_co_rewinddir(pdu, fidp);
} else {
v9fs_co_seekdir(pdu, fidp, initial_offset);
if (s->proto_version != V9FS_PROTO_2000L) {
warn_report_once(
"9p: bad client: T_readdir request only expected with 9P2000.L "
"protocol version"
);
retval = -EOPNOTSUPP;
goto out;
}
count = v9fs_do_readdir(pdu, fidp, max_count);
count = v9fs_do_readdir(pdu, fidp, (off_t) initial_offset, max_count);
if (count < 0) {
retval = count;
goto out;

50
hw/9pfs/9p.h
View File

@ -197,24 +197,63 @@ typedef struct V9fsXattr
typedef struct V9fsDir {
DIR *stream;
CoMutex readdir_mutex;
P9ProtoVersion proto_version;
/* readdir mutex type used for 9P2000.u protocol variant */
CoMutex readdir_mutex_u;
/* readdir mutex type used for 9P2000.L protocol variant */
QemuMutex readdir_mutex_L;
} V9fsDir;
static inline void v9fs_readdir_lock(V9fsDir *dir)
{
qemu_co_mutex_lock(&dir->readdir_mutex);
if (dir->proto_version == V9FS_PROTO_2000U) {
qemu_co_mutex_lock(&dir->readdir_mutex_u);
} else {
qemu_mutex_lock(&dir->readdir_mutex_L);
}
}
static inline void v9fs_readdir_unlock(V9fsDir *dir)
{
qemu_co_mutex_unlock(&dir->readdir_mutex);
if (dir->proto_version == V9FS_PROTO_2000U) {
qemu_co_mutex_unlock(&dir->readdir_mutex_u);
} else {
qemu_mutex_unlock(&dir->readdir_mutex_L);
}
}
static inline void v9fs_readdir_init(V9fsDir *dir)
static inline void v9fs_readdir_init(P9ProtoVersion proto_version, V9fsDir *dir)
{
qemu_co_mutex_init(&dir->readdir_mutex);
dir->proto_version = proto_version;
if (proto_version == V9FS_PROTO_2000U) {
qemu_co_mutex_init(&dir->readdir_mutex_u);
} else {
qemu_mutex_init(&dir->readdir_mutex_L);
}
}
/**
* Type for 9p fs drivers' (a.k.a. 9p backends) result of readdir requests,
* which is a chained list of directory entries.
*/
typedef struct V9fsDirEnt {
/* mandatory (must not be NULL) information for all readdir requests */
struct dirent *dent;
/*
* optional (may be NULL): A full stat of each directory entry is just
* done if explicitly told to fs driver.
*/
struct stat *st;
/*
* instead of an array, directory entries are always returned as
* chained list, that's because the amount of entries retrieved by fs
* drivers is dependent on the individual entries' name (since response
* messages are size limited), so the final amount cannot be estimated
* before hand
*/
struct V9fsDirEnt *next;
} V9fsDirEnt;
/*
* Filled by fs driver on open and other
* calls.
@ -419,6 +458,7 @@ void v9fs_path_init(V9fsPath *path);
void v9fs_path_free(V9fsPath *path);
void v9fs_path_sprintf(V9fsPath *path, const char *fmt, ...);
void v9fs_path_copy(V9fsPath *dst, const V9fsPath *src);
size_t v9fs_readdir_response_size(V9fsString *name);
int v9fs_name_to_path(V9fsState *s, V9fsPath *dirpath,
const char *name, V9fsPath *path);
int v9fs_device_realize_common(V9fsState *s, const V9fsTransport *t,

203
hw/9pfs/codir.c
View File

@ -18,28 +18,209 @@
#include "qemu/main-loop.h"
#include "coth.h"
/*
* Intended to be called from bottom-half (e.g. background I/O thread)
* context.
*/
static int do_readdir(V9fsPDU *pdu, V9fsFidState *fidp, struct dirent **dent)
{
int err = 0;
V9fsState *s = pdu->s;
struct dirent *entry;
errno = 0;
entry = s->ops->readdir(&s->ctx, &fidp->fs);
if (!entry && errno) {
*dent = NULL;
err = -errno;
} else {
*dent = entry;
}
return err;
}
/*
* TODO: This will be removed for performance reasons.
* Use v9fs_co_readdir_many() instead.
*/
int coroutine_fn v9fs_co_readdir(V9fsPDU *pdu, V9fsFidState *fidp,
struct dirent **dent)
{
int err;
V9fsState *s = pdu->s;
if (v9fs_request_cancelled(pdu)) {
return -EINTR;
}
v9fs_co_run_in_worker(
{
struct dirent *entry;
v9fs_co_run_in_worker({
err = do_readdir(pdu, fidp, dent);
});
return err;
}
errno = 0;
entry = s->ops->readdir(&s->ctx, &fidp->fs);
if (!entry && errno) {
/*
* This is solely executed on a background IO thread.
*
* See v9fs_co_readdir_many() (as its only user) below for details.
*/
static int do_readdir_many(V9fsPDU *pdu, V9fsFidState *fidp,
struct V9fsDirEnt **entries, off_t offset,
int32_t maxsize, bool dostat)
{
V9fsState *s = pdu->s;
V9fsString name;
int len, err = 0;
int32_t size = 0;
off_t saved_dir_pos;
struct dirent *dent;
struct V9fsDirEnt *e = NULL;
V9fsPath path;
struct stat stbuf;
*entries = NULL;
v9fs_path_init(&path);
/*
* TODO: Here should be a warn_report_once() if lock failed.
*
* With a good 9p client we should not get into concurrency here,
* because a good client would not use the same fid for concurrent
* requests. We do the lock here for safety reasons though. However
* the client would then suffer performance issues, so better log that
* issue here.
*/
v9fs_readdir_lock(&fidp->fs.dir);
/* seek directory to requested initial position */
if (offset == 0) {
s->ops->rewinddir(&s->ctx, &fidp->fs);
} else {
s->ops->seekdir(&s->ctx, &fidp->fs, offset);
}
/* save the directory position */
saved_dir_pos = s->ops->telldir(&s->ctx, &fidp->fs);
if (saved_dir_pos < 0) {
err = saved_dir_pos;
goto out;
}
while (true) {
/* interrupt loop if request was cancelled by a Tflush request */
if (v9fs_request_cancelled(pdu)) {
err = -EINTR;
break;
}
/* get directory entry from fs driver */
err = do_readdir(pdu, fidp, &dent);
if (err || !dent) {
break;
}
/*
* stop this loop as soon as it would exceed the allowed maximum
* response message size for the directory entries collected so far,
* because anything beyond that size would need to be discarded by
* 9p controller (main thread / top half) anyway
*/
v9fs_string_init(&name);
v9fs_string_sprintf(&name, "%s", dent->d_name);
len = v9fs_readdir_response_size(&name);
v9fs_string_free(&name);
if (size + len > maxsize) {
/* this is not an error case actually */
break;
}
/* append next node to result chain */
if (!e) {
*entries = e = g_malloc0(sizeof(V9fsDirEnt));
} else {
e = e->next = g_malloc0(sizeof(V9fsDirEnt));
}
e->dent = g_malloc0(sizeof(struct dirent));
memcpy(e->dent, dent, sizeof(struct dirent));
/* perform a full stat() for directory entry if requested by caller */
if (dostat) {
err = s->ops->name_to_path(
&s->ctx, &fidp->path, dent->d_name, &path
);
if (err < 0) {
err = -errno;
} else {
*dent = entry;
err = 0;
break;
}
});
err = s->ops->lstat(&s->ctx, &path, &stbuf);
if (err < 0) {
err = -errno;
break;
}
e->st = g_malloc0(sizeof(struct stat));
memcpy(e->st, &stbuf, sizeof(struct stat));
}
size += len;
saved_dir_pos = dent->d_off;
}
/* restore (last) saved position */
s->ops->seekdir(&s->ctx, &fidp->fs, saved_dir_pos);
out:
v9fs_readdir_unlock(&fidp->fs.dir);
v9fs_path_free(&path);
if (err < 0) {
return err;
}
return size;
}
/**
* @brief Reads multiple directory entries in one rush.
*
* Retrieves the requested (max. amount of) directory entries from the fs
* driver. This function must only be called by the main IO thread (top half).
* Internally this function call will be dispatched to a background IO thread
* (bottom half) where it is eventually executed by the fs driver.
*
* @discussion Acquiring multiple directory entries in one rush from the fs
* driver, instead of retrieving each directory entry individually, is very
* beneficial from performance point of view. Because for every fs driver
* request latency is added, which in practice could lead to overall
* latencies of several hundred ms for reading all entries (of just a single
* directory) if every directory entry was individually requested from fs
* driver.
*
* @note You must @b ALWAYS call @c v9fs_free_dirents(entries) after calling
* v9fs_co_readdir_many(), both on success and on error cases of this
* function, to avoid memory leaks once @p entries are no longer needed.
*
* @param pdu - the causing 9p (T_readdir) client request
* @param fidp - already opened directory where readdir shall be performed on
* @param entries - output for directory entries (must not be NULL)
* @param offset - initial position inside the directory the function shall
* seek to before retrieving the directory entries
* @param maxsize - maximum result message body size (in bytes)
* @param dostat - whether a stat() should be performed and returned for
* each directory entry
* @returns resulting response message body size (in bytes) on success,
* negative error code otherwise
*/
int coroutine_fn v9fs_co_readdir_many(V9fsPDU *pdu, V9fsFidState *fidp,
struct V9fsDirEnt **entries,
off_t offset, int32_t maxsize,
bool dostat)
{
int err = 0;
if (v9fs_request_cancelled(pdu)) {
return -EINTR;
}
v9fs_co_run_in_worker({
err = do_readdir_many(pdu, fidp, entries, offset, maxsize, dostat);
});
return err;
}

15
hw/9pfs/coth.h
View File

@ -19,7 +19,7 @@
#include "qemu/coroutine.h"
#include "9p.h"
/*
/**
* we want to use bottom half because we want to make sure the below
* sequence of events.
*
@ -28,6 +28,16 @@
* 3. Enter the coroutine in the worker thread.
* we cannot swap step 1 and 2, because that would imply worker thread
* can enter coroutine while step1 is still running
*
* @b PERFORMANCE @b CONSIDERATIONS: As a rule of thumb, keep in mind
* that hopping between threads adds @b latency! So when handling a
* 9pfs request, avoid calling v9fs_co_run_in_worker() too often, because
* this might otherwise sum up to a significant, huge overall latency for
* providing the response for just a single request. For that reason it
* is highly recommended to fetch all data from fs driver with a single
* fs driver request on a background I/O thread (bottom half) in one rush
* first and then eventually assembling the final response from that data
* on main I/O thread (top half).
*/
#define v9fs_co_run_in_worker(code_block) \
do { \
@ -49,6 +59,9 @@
void co_run_in_worker_bh(void *);
int coroutine_fn v9fs_co_readlink(V9fsPDU *, V9fsPath *, V9fsString *);
int coroutine_fn v9fs_co_readdir(V9fsPDU *, V9fsFidState *, struct dirent **);
int coroutine_fn v9fs_co_readdir_many(V9fsPDU *, V9fsFidState *,
struct V9fsDirEnt **, off_t, int32_t,
bool);
off_t coroutine_fn v9fs_co_telldir(V9fsPDU *, V9fsFidState *);
void coroutine_fn v9fs_co_seekdir(V9fsPDU *, V9fsFidState *, off_t);
void coroutine_fn v9fs_co_rewinddir(V9fsPDU *, V9fsFidState *);

108
tests/qtest/virtio-9p-test.c
View File

@ -578,6 +578,7 @@ static bool fs_dirents_contain_name(struct V9fsDirent *e, const char* name)
return false;
}
/* basic readdir test where reply fits into a single response message */
static void fs_readdir(void *obj, void *data, QGuestAllocator *t_alloc)
{
QVirtio9P *v9p = obj;
@ -631,6 +632,89 @@ static void fs_readdir(void *obj, void *data, QGuestAllocator *t_alloc)
g_free(wnames[0]);
}
/* readdir test where overall request is split over several messages */
static void fs_readdir_split(void *obj, void *data, QGuestAllocator *t_alloc,
uint32_t count)
{
QVirtio9P *v9p = obj;
alloc = t_alloc;
char *const wnames[] = { g_strdup(QTEST_V9FS_SYNTH_READDIR_DIR) };
uint16_t nqid;
v9fs_qid qid;
uint32_t nentries, npartialentries;
struct V9fsDirent *entries, *tail, *partialentries;
P9Req *req;
int fid;
uint64_t offset;
fs_attach(v9p, NULL, t_alloc);
fid = 1;
offset = 0;
entries = NULL;
nentries = 0;
tail = NULL;
req = v9fs_twalk(v9p, 0, fid, 1, wnames, 0);
v9fs_req_wait_for_reply(req, NULL);
v9fs_rwalk(req, &nqid, NULL);
g_assert_cmpint(nqid, ==, 1);
req = v9fs_tlopen(v9p, fid, O_DIRECTORY, 0);
v9fs_req_wait_for_reply(req, NULL);
v9fs_rlopen(req, &qid, NULL);
/*
* send as many Treaddir requests as required to get all directory
* entries
*/
while (true) {
npartialentries = 0;
partialentries = NULL;
req = v9fs_treaddir(v9p, fid, offset, count, 0);
v9fs_req_wait_for_reply(req, NULL);
v9fs_rreaddir(req, &count, &npartialentries, &partialentries);
if (npartialentries > 0 && partialentries) {
if (!entries) {
entries = partialentries;
nentries = npartialentries;
tail = partialentries;
} else {
tail->next = partialentries;
nentries += npartialentries;
}
while (tail->next) {
tail = tail->next;
}
offset = tail->offset;
} else {
break;
}
}
g_assert_cmpint(
nentries, ==,
QTEST_V9FS_SYNTH_READDIR_NFILES + 2 /* "." and ".." */
);
/*
* Check all file names exist in returned entries, ignore their order
* though.
*/
g_assert_cmpint(fs_dirents_contain_name(entries, "."), ==, true);
g_assert_cmpint(fs_dirents_contain_name(entries, ".."), ==, true);
for (int i = 0; i < QTEST_V9FS_SYNTH_READDIR_NFILES; ++i) {
char *name = g_strdup_printf(QTEST_V9FS_SYNTH_READDIR_FILE, i);
g_assert_cmpint(fs_dirents_contain_name(entries, name), ==, true);
g_free(name);
}
v9fs_free_dirents(entries);
g_free(wnames[0]);
}
static void fs_walk_no_slash(void *obj, void *data, QGuestAllocator *t_alloc)
{
QVirtio9P *v9p = obj;
@ -793,6 +877,24 @@ static void fs_flush_ignored(void *obj, void *data, QGuestAllocator *t_alloc)
g_free(wnames[0]);
}
static void fs_readdir_split_128(void *obj, void *data,
QGuestAllocator *t_alloc)
{
fs_readdir_split(obj, data, t_alloc, 128);
}
static void fs_readdir_split_256(void *obj, void *data,
QGuestAllocator *t_alloc)
{
fs_readdir_split(obj, data, t_alloc, 256);
}
static void fs_readdir_split_512(void *obj, void *data,
QGuestAllocator *t_alloc)
{
fs_readdir_split(obj, data, t_alloc, 512);
}
static void register_virtio_9p_test(void)
{
qos_add_test("config", "virtio-9p", pci_config, NULL);
@ -810,6 +912,12 @@ static void register_virtio_9p_test(void)
qos_add_test("fs/flush/ignored", "virtio-9p", fs_flush_ignored,
NULL);
qos_add_test("fs/readdir/basic", "virtio-9p", fs_readdir, NULL);
qos_add_test("fs/readdir/split_512", "virtio-9p",
fs_readdir_split_512, NULL);
qos_add_test("fs/readdir/split_256", "virtio-9p",
fs_readdir_split_256, NULL);
qos_add_test("fs/readdir/split_128", "virtio-9p",
fs_readdir_split_128, NULL);
}
libqos_init(register_virtio_9p_test);