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Message-ID: <162431195953.2908479.16770977195634296638.stgit@warthog.procyon.org.uk>
Date: Mon, 21 Jun 2021 22:45:59 +0100
From: David Howells <dhowells@...hat.com>
To: linux-cachefs@...hat.com
Cc: dhowells@...hat.com, Anna Schumaker <anna.schumaker@...app.com>,
Steve French <sfrench@...ba.org>,
Dominique Martinet <asmadeus@...ewreck.org>,
Jeff Layton <jlayton@...hat.com>,
David Wysochanski <dwysocha@...hat.com>,
linux-afs@...ts.infradead.org, linux-nfs@...r.kernel.org,
linux-cifs@...r.kernel.org, ceph-devel@...r.kernel.org,
v9fs-developer@...ts.sourceforge.net,
linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 06/12] fscache, cachefiles: Remove the histogram stuff
Remove the histogram stuff as it's mostly going to be outdated.
Signed-off-by: David Howells <dhowells@...hat.com>
---
fs/cachefiles/Kconfig | 19 -------
fs/cachefiles/Makefile | 2 -
fs/cachefiles/internal.h | 25 ---------
fs/cachefiles/main.c | 7 ---
fs/cachefiles/namei.c | 13 -----
fs/cachefiles/proc.c | 114 -----------------------------------------
fs/fscache/Kconfig | 17 ------
fs/fscache/Makefile | 1
fs/fscache/histogram.c | 87 -------------------------------
fs/fscache/internal.h | 24 ---------
fs/fscache/object.c | 5 --
fs/fscache/operation.c | 3 -
fs/fscache/page.c | 6 --
fs/fscache/proc.c | 13 -----
include/linux/fscache-cache.h | 1
15 files changed, 337 deletions(-)
delete mode 100644 fs/cachefiles/proc.c
delete mode 100644 fs/fscache/histogram.c
diff --git a/fs/cachefiles/Kconfig b/fs/cachefiles/Kconfig
index ff9ca55a9ae9..6827b40f7ddc 100644
--- a/fs/cachefiles/Kconfig
+++ b/fs/cachefiles/Kconfig
@@ -19,22 +19,3 @@ config CACHEFILES_DEBUG
caching on files module. If this is set, the debugging output may be
enabled by setting bits in /sys/modules/cachefiles/parameter/debug or
by including a debugging specifier in /etc/cachefilesd.conf.
-
-config CACHEFILES_HISTOGRAM
- bool "Gather latency information on CacheFiles"
- depends on CACHEFILES && PROC_FS
- help
-
- This option causes latency information to be gathered on CacheFiles
- operation and exported through file:
-
- /proc/fs/cachefiles/histogram
-
- The generation of this histogram adds a certain amount of overhead to
- execution as there are a number of points at which data is gathered,
- and on a multi-CPU system these may be on cachelines that keep
- bouncing between CPUs. On the other hand, the histogram may be
- useful for debugging purposes. Saying 'N' here is recommended.
-
- See Documentation/filesystems/caching/cachefiles.rst for more
- information.
diff --git a/fs/cachefiles/Makefile b/fs/cachefiles/Makefile
index 2227dc2d5498..02fd17731769 100644
--- a/fs/cachefiles/Makefile
+++ b/fs/cachefiles/Makefile
@@ -15,6 +15,4 @@ cachefiles-y := \
security.o \
xattr.o
-cachefiles-$(CONFIG_CACHEFILES_HISTOGRAM) += proc.o
-
obj-$(CONFIG_CACHEFILES) := cachefiles.o
diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h
index 4ed83aa5253b..0a511c36dab8 100644
--- a/fs/cachefiles/internal.h
+++ b/fs/cachefiles/internal.h
@@ -180,31 +180,6 @@ extern int cachefiles_cull(struct cachefiles_cache *cache, struct dentry *dir,
extern int cachefiles_check_in_use(struct cachefiles_cache *cache,
struct dentry *dir, char *filename);
-/*
- * proc.c
- */
-#ifdef CONFIG_CACHEFILES_HISTOGRAM
-extern atomic_t cachefiles_lookup_histogram[HZ];
-extern atomic_t cachefiles_mkdir_histogram[HZ];
-extern atomic_t cachefiles_create_histogram[HZ];
-
-extern int __init cachefiles_proc_init(void);
-extern void cachefiles_proc_cleanup(void);
-static inline
-void cachefiles_hist(atomic_t histogram[], unsigned long start_jif)
-{
- unsigned long jif = jiffies - start_jif;
- if (jif >= HZ)
- jif = HZ - 1;
- atomic_inc(&histogram[jif]);
-}
-
-#else
-#define cachefiles_proc_init() (0)
-#define cachefiles_proc_cleanup() do {} while (0)
-#define cachefiles_hist(hist, start_jif) do {} while (0)
-#endif
-
/*
* rdwr.c
*/
diff --git a/fs/cachefiles/main.c b/fs/cachefiles/main.c
index ddf0cd58d60c..9c8d34c49b12 100644
--- a/fs/cachefiles/main.c
+++ b/fs/cachefiles/main.c
@@ -69,15 +69,9 @@ static int __init cachefiles_init(void)
goto error_object_jar;
}
- ret = cachefiles_proc_init();
- if (ret < 0)
- goto error_proc;
-
pr_info("Loaded\n");
return 0;
-error_proc:
- kmem_cache_destroy(cachefiles_object_jar);
error_object_jar:
misc_deregister(&cachefiles_dev);
error_dev:
@@ -94,7 +88,6 @@ static void __exit cachefiles_exit(void)
{
pr_info("Unloading\n");
- cachefiles_proc_cleanup();
kmem_cache_destroy(cachefiles_object_jar);
misc_deregister(&cachefiles_dev);
}
diff --git a/fs/cachefiles/namei.c b/fs/cachefiles/namei.c
index 7bf0732ae25c..92aa550dae7e 100644
--- a/fs/cachefiles/namei.c
+++ b/fs/cachefiles/namei.c
@@ -496,7 +496,6 @@ int cachefiles_walk_to_object(struct cachefiles_object *parent,
struct dentry *dir, *next = NULL;
struct inode *inode;
struct path path;
- unsigned long start;
const char *name;
int ret, nlen;
@@ -535,9 +534,7 @@ int cachefiles_walk_to_object(struct cachefiles_object *parent,
inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
- start = jiffies;
next = lookup_one_len(name, dir, nlen);
- cachefiles_hist(cachefiles_lookup_histogram, start);
if (IS_ERR(next)) {
trace_cachefiles_lookup(object, next, NULL);
goto lookup_error;
@@ -568,9 +565,7 @@ int cachefiles_walk_to_object(struct cachefiles_object *parent,
ret = security_path_mkdir(&path, next, 0);
if (ret < 0)
goto create_error;
- start = jiffies;
ret = vfs_mkdir(&init_user_ns, d_inode(dir), next, 0);
- cachefiles_hist(cachefiles_mkdir_histogram, start);
if (!key)
trace_cachefiles_mkdir(object, next, ret);
if (ret < 0)
@@ -604,10 +599,8 @@ int cachefiles_walk_to_object(struct cachefiles_object *parent,
ret = security_path_mknod(&path, next, S_IFREG, 0);
if (ret < 0)
goto create_error;
- start = jiffies;
ret = vfs_create(&init_user_ns, d_inode(dir), next,
S_IFREG, true);
- cachefiles_hist(cachefiles_create_histogram, start);
trace_cachefiles_create(object, next, ret);
if (ret < 0)
goto create_error;
@@ -765,7 +758,6 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
const char *dirname)
{
struct dentry *subdir;
- unsigned long start;
struct path path;
int ret;
@@ -775,9 +767,7 @@ struct dentry *cachefiles_get_directory(struct cachefiles_cache *cache,
inode_lock(d_inode(dir));
retry:
- start = jiffies;
subdir = lookup_one_len(dirname, dir, strlen(dirname));
- cachefiles_hist(cachefiles_lookup_histogram, start);
if (IS_ERR(subdir)) {
if (PTR_ERR(subdir) == -ENOMEM)
goto nomem_d_alloc;
@@ -876,7 +866,6 @@ static struct dentry *cachefiles_check_active(struct cachefiles_cache *cache,
struct cachefiles_object *object;
struct rb_node *_n;
struct dentry *victim;
- unsigned long start;
int ret;
//_enter(",%pd/,%s",
@@ -885,9 +874,7 @@ static struct dentry *cachefiles_check_active(struct cachefiles_cache *cache,
/* look up the victim */
inode_lock_nested(d_inode(dir), I_MUTEX_PARENT);
- start = jiffies;
victim = lookup_one_len(filename, dir, strlen(filename));
- cachefiles_hist(cachefiles_lookup_histogram, start);
if (IS_ERR(victim))
goto lookup_error;
diff --git a/fs/cachefiles/proc.c b/fs/cachefiles/proc.c
deleted file mode 100644
index 6e67aea0f24e..000000000000
--- a/fs/cachefiles/proc.c
+++ /dev/null
@@ -1,114 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* CacheFiles statistics
- *
- * Copyright (C) 2007 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@...hat.com)
- */
-
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include "internal.h"
-
-atomic_t cachefiles_lookup_histogram[HZ];
-atomic_t cachefiles_mkdir_histogram[HZ];
-atomic_t cachefiles_create_histogram[HZ];
-
-/*
- * display the latency histogram
- */
-static int cachefiles_histogram_show(struct seq_file *m, void *v)
-{
- unsigned long index;
- unsigned x, y, z, t;
-
- switch ((unsigned long) v) {
- case 1:
- seq_puts(m, "JIFS SECS LOOKUPS MKDIRS CREATES\n");
- return 0;
- case 2:
- seq_puts(m, "===== ===== ========= ========= =========\n");
- return 0;
- default:
- index = (unsigned long) v - 3;
- x = atomic_read(&cachefiles_lookup_histogram[index]);
- y = atomic_read(&cachefiles_mkdir_histogram[index]);
- z = atomic_read(&cachefiles_create_histogram[index]);
- if (x == 0 && y == 0 && z == 0)
- return 0;
-
- t = (index * 1000) / HZ;
-
- seq_printf(m, "%4lu 0.%03u %9u %9u %9u\n", index, t, x, y, z);
- return 0;
- }
-}
-
-/*
- * set up the iterator to start reading from the first line
- */
-static void *cachefiles_histogram_start(struct seq_file *m, loff_t *_pos)
-{
- if ((unsigned long long)*_pos >= HZ + 2)
- return NULL;
- if (*_pos == 0)
- *_pos = 1;
- return (void *)(unsigned long) *_pos;
-}
-
-/*
- * move to the next line
- */
-static void *cachefiles_histogram_next(struct seq_file *m, void *v, loff_t *pos)
-{
- (*pos)++;
- return (unsigned long long)*pos > HZ + 2 ?
- NULL : (void *)(unsigned long) *pos;
-}
-
-/*
- * clean up after reading
- */
-static void cachefiles_histogram_stop(struct seq_file *m, void *v)
-{
-}
-
-static const struct seq_operations cachefiles_histogram_ops = {
- .start = cachefiles_histogram_start,
- .stop = cachefiles_histogram_stop,
- .next = cachefiles_histogram_next,
- .show = cachefiles_histogram_show,
-};
-
-/*
- * initialise the /proc/fs/cachefiles/ directory
- */
-int __init cachefiles_proc_init(void)
-{
- _enter("");
-
- if (!proc_mkdir("fs/cachefiles", NULL))
- goto error_dir;
-
- if (!proc_create_seq("fs/cachefiles/histogram", S_IFREG | 0444, NULL,
- &cachefiles_histogram_ops))
- goto error_histogram;
-
- _leave(" = 0");
- return 0;
-
-error_histogram:
- remove_proc_entry("fs/cachefiles", NULL);
-error_dir:
- _leave(" = -ENOMEM");
- return -ENOMEM;
-}
-
-/*
- * clean up the /proc/fs/cachefiles/ directory
- */
-void cachefiles_proc_cleanup(void)
-{
- remove_proc_entry("fs/cachefiles/histogram", NULL);
- remove_proc_entry("fs/cachefiles", NULL);
-}
diff --git a/fs/fscache/Kconfig b/fs/fscache/Kconfig
index 92c87d8e0913..5e3a5b3f950d 100644
--- a/fs/fscache/Kconfig
+++ b/fs/fscache/Kconfig
@@ -29,23 +29,6 @@ config FSCACHE_STATS
See Documentation/filesystems/caching/fscache.rst for more information.
-config FSCACHE_HISTOGRAM
- bool "Gather latency information on local caching"
- depends on FSCACHE && PROC_FS
- help
- This option causes latency information to be gathered on local
- caching and exported through file:
-
- /proc/fs/fscache/histogram
-
- The generation of this histogram adds a certain amount of overhead to
- execution as there are a number of points at which data is gathered,
- and on a multi-CPU system these may be on cachelines that keep
- bouncing between CPUs. On the other hand, the histogram may be
- useful for debugging purposes. Saying 'N' here is recommended.
-
- See Documentation/filesystems/caching/fscache.rst for more information.
-
config FSCACHE_DEBUG
bool "Debug FS-Cache"
depends on FSCACHE
diff --git a/fs/fscache/Makefile b/fs/fscache/Makefile
index 3b2ffa93ac18..45d5235a449b 100644
--- a/fs/fscache/Makefile
+++ b/fs/fscache/Makefile
@@ -16,7 +16,6 @@ fscache-y := \
fscache-$(CONFIG_PROC_FS) += proc.o
fscache-$(CONFIG_FSCACHE_STATS) += stats.o
-fscache-$(CONFIG_FSCACHE_HISTOGRAM) += histogram.o
fscache-$(CONFIG_FSCACHE_OBJECT_LIST) += object-list.o
obj-$(CONFIG_FSCACHE) := fscache.o
diff --git a/fs/fscache/histogram.c b/fs/fscache/histogram.c
deleted file mode 100644
index 4e5beeaaf454..000000000000
--- a/fs/fscache/histogram.c
+++ /dev/null
@@ -1,87 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-or-later
-/* FS-Cache latency histogram
- *
- * Copyright (C) 2008 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@...hat.com)
- */
-
-#define FSCACHE_DEBUG_LEVEL THREAD
-#include <linux/module.h>
-#include <linux/proc_fs.h>
-#include <linux/seq_file.h>
-#include "internal.h"
-
-atomic_t fscache_obj_instantiate_histogram[HZ];
-atomic_t fscache_objs_histogram[HZ];
-atomic_t fscache_ops_histogram[HZ];
-atomic_t fscache_retrieval_delay_histogram[HZ];
-atomic_t fscache_retrieval_histogram[HZ];
-
-/*
- * display the time-taken histogram
- */
-static int fscache_histogram_show(struct seq_file *m, void *v)
-{
- unsigned long index;
- unsigned n[5], t;
-
- switch ((unsigned long) v) {
- case 1:
- seq_puts(m, "JIFS SECS OBJ INST OP RUNS OBJ RUNS RETRV DLY RETRIEVLS\n");
- return 0;
- case 2:
- seq_puts(m, "===== ===== ========= ========= ========= ========= =========\n");
- return 0;
- default:
- index = (unsigned long) v - 3;
- n[0] = atomic_read(&fscache_obj_instantiate_histogram[index]);
- n[1] = atomic_read(&fscache_ops_histogram[index]);
- n[2] = atomic_read(&fscache_objs_histogram[index]);
- n[3] = atomic_read(&fscache_retrieval_delay_histogram[index]);
- n[4] = atomic_read(&fscache_retrieval_histogram[index]);
- if (!(n[0] | n[1] | n[2] | n[3] | n[4]))
- return 0;
-
- t = (index * 1000) / HZ;
-
- seq_printf(m, "%4lu 0.%03u %9u %9u %9u %9u %9u\n",
- index, t, n[0], n[1], n[2], n[3], n[4]);
- return 0;
- }
-}
-
-/*
- * set up the iterator to start reading from the first line
- */
-static void *fscache_histogram_start(struct seq_file *m, loff_t *_pos)
-{
- if ((unsigned long long)*_pos >= HZ + 2)
- return NULL;
- if (*_pos == 0)
- *_pos = 1;
- return (void *)(unsigned long) *_pos;
-}
-
-/*
- * move to the next line
- */
-static void *fscache_histogram_next(struct seq_file *m, void *v, loff_t *pos)
-{
- (*pos)++;
- return (unsigned long long)*pos > HZ + 2 ?
- NULL : (void *)(unsigned long) *pos;
-}
-
-/*
- * clean up after reading
- */
-static void fscache_histogram_stop(struct seq_file *m, void *v)
-{
-}
-
-const struct seq_operations fscache_histogram_ops = {
- .start = fscache_histogram_start,
- .stop = fscache_histogram_stop,
- .next = fscache_histogram_next,
- .show = fscache_histogram_show,
-};
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 207a6bc81ca9..796678b2b32a 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -63,30 +63,6 @@ extern void fscache_cookie_put(struct fscache_cookie *,
extern struct fscache_cookie fscache_fsdef_index;
extern struct fscache_cookie_def fscache_fsdef_netfs_def;
-/*
- * histogram.c
- */
-#ifdef CONFIG_FSCACHE_HISTOGRAM
-extern atomic_t fscache_obj_instantiate_histogram[HZ];
-extern atomic_t fscache_objs_histogram[HZ];
-extern atomic_t fscache_ops_histogram[HZ];
-extern atomic_t fscache_retrieval_delay_histogram[HZ];
-extern atomic_t fscache_retrieval_histogram[HZ];
-
-static inline void fscache_hist(atomic_t histogram[], unsigned long start_jif)
-{
- unsigned long jif = jiffies - start_jif;
- if (jif >= HZ)
- jif = HZ - 1;
- atomic_inc(&histogram[jif]);
-}
-
-extern const struct seq_operations fscache_histogram_ops;
-
-#else
-#define fscache_hist(hist, start_jif) do {} while (0)
-#endif
-
/*
* main.c
*/
diff --git a/fs/fscache/object.c b/fs/fscache/object.c
index cb2146e02cd5..5dbaab2e1262 100644
--- a/fs/fscache/object.c
+++ b/fs/fscache/object.c
@@ -277,13 +277,10 @@ static void fscache_object_work_func(struct work_struct *work)
{
struct fscache_object *object =
container_of(work, struct fscache_object, work);
- unsigned long start;
_enter("{OBJ%x}", object->debug_id);
- start = jiffies;
fscache_object_sm_dispatcher(object);
- fscache_hist(fscache_objs_histogram, start);
fscache_put_object(object, fscache_obj_put_work);
}
@@ -436,7 +433,6 @@ static const struct fscache_state *fscache_parent_ready(struct fscache_object *o
spin_lock(&parent->lock);
parent->n_ops++;
parent->n_obj_ops++;
- object->lookup_jif = jiffies;
spin_unlock(&parent->lock);
_leave("");
@@ -596,7 +592,6 @@ static const struct fscache_state *fscache_object_available(struct fscache_objec
object->cache->ops->lookup_complete(object);
fscache_stat_d(&fscache_n_cop_lookup_complete);
- fscache_hist(fscache_obj_instantiate_histogram, object->lookup_jif);
fscache_stat(&fscache_n_object_avail);
_leave("");
diff --git a/fs/fscache/operation.c b/fs/fscache/operation.c
index 4a5651d4904e..433877107700 100644
--- a/fs/fscache/operation.c
+++ b/fs/fscache/operation.c
@@ -616,7 +616,6 @@ void fscache_op_work_func(struct work_struct *work)
{
struct fscache_operation *op =
container_of(work, struct fscache_operation, work);
- unsigned long start;
_enter("{OBJ%x OP%x,%d}",
op->object->debug_id, op->debug_id, atomic_read(&op->usage));
@@ -624,9 +623,7 @@ void fscache_op_work_func(struct work_struct *work)
trace_fscache_op(op->object->cookie, op, fscache_op_work);
ASSERT(op->processor != NULL);
- start = jiffies;
op->processor(op);
- fscache_hist(fscache_ops_histogram, start);
fscache_put_operation(op);
_leave("");
diff --git a/fs/fscache/page.c b/fs/fscache/page.c
index 991b0a871744..27df94ef0e0b 100644
--- a/fs/fscache/page.c
+++ b/fs/fscache/page.c
@@ -289,7 +289,6 @@ static void fscache_release_retrieval_op(struct fscache_operation *_op)
ASSERTIFCMP(op->op.state != FSCACHE_OP_ST_INITIALISED,
atomic_read(&op->n_pages), ==, 0);
- fscache_hist(fscache_retrieval_histogram, op->start_time);
if (op->context)
fscache_put_context(op->cookie, op->context);
@@ -324,7 +323,6 @@ struct fscache_retrieval *fscache_alloc_retrieval(
op->mapping = mapping;
op->end_io_func = end_io_func;
op->context = context;
- op->start_time = jiffies;
INIT_LIST_HEAD(&op->to_do);
/* Pin the netfs read context in case we need to do the actual netfs
@@ -340,8 +338,6 @@ struct fscache_retrieval *fscache_alloc_retrieval(
*/
int fscache_wait_for_deferred_lookup(struct fscache_cookie *cookie)
{
- unsigned long jif;
-
_enter("");
if (!test_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags)) {
@@ -351,7 +347,6 @@ int fscache_wait_for_deferred_lookup(struct fscache_cookie *cookie)
fscache_stat(&fscache_n_retrievals_wait);
- jif = jiffies;
if (wait_on_bit(&cookie->flags, FSCACHE_COOKIE_LOOKING_UP,
TASK_INTERRUPTIBLE) != 0) {
fscache_stat(&fscache_n_retrievals_intr);
@@ -362,7 +357,6 @@ int fscache_wait_for_deferred_lookup(struct fscache_cookie *cookie)
ASSERT(!test_bit(FSCACHE_COOKIE_LOOKING_UP, &cookie->flags));
smp_rmb();
- fscache_hist(fscache_retrieval_delay_histogram, jif);
_leave(" = 0 [dly]");
return 0;
}
diff --git a/fs/fscache/proc.c b/fs/fscache/proc.c
index da51fdfc8641..061df8f61ffc 100644
--- a/fs/fscache/proc.c
+++ b/fs/fscache/proc.c
@@ -31,12 +31,6 @@ int __init fscache_proc_init(void)
goto error_stats;
#endif
-#ifdef CONFIG_FSCACHE_HISTOGRAM
- if (!proc_create_seq("fs/fscache/histogram", S_IFREG | 0444, NULL,
- &fscache_histogram_ops))
- goto error_histogram;
-#endif
-
#ifdef CONFIG_FSCACHE_OBJECT_LIST
if (!proc_create("fs/fscache/objects", S_IFREG | 0444, NULL,
&fscache_objlist_proc_ops))
@@ -49,10 +43,6 @@ int __init fscache_proc_init(void)
#ifdef CONFIG_FSCACHE_OBJECT_LIST
error_objects:
#endif
-#ifdef CONFIG_FSCACHE_HISTOGRAM
- remove_proc_entry("fs/fscache/histogram", NULL);
-error_histogram:
-#endif
#ifdef CONFIG_FSCACHE_STATS
remove_proc_entry("fs/fscache/stats", NULL);
error_stats:
@@ -73,9 +63,6 @@ void fscache_proc_cleanup(void)
#ifdef CONFIG_FSCACHE_OBJECT_LIST
remove_proc_entry("fs/fscache/objects", NULL);
#endif
-#ifdef CONFIG_FSCACHE_HISTOGRAM
- remove_proc_entry("fs/fscache/histogram", NULL);
-#endif
#ifdef CONFIG_FSCACHE_STATS
remove_proc_entry("fs/fscache/stats", NULL);
#endif
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 3235ddbdcc09..fbff0b7e3ef1 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -147,7 +147,6 @@ struct fscache_retrieval {
fscache_rw_complete_t end_io_func; /* function to call on I/O completion */
void *context; /* netfs read context (pinned) */
struct list_head to_do; /* list of things to be done by the backend */
- unsigned long start_time; /* time at which retrieval started */
atomic_t n_pages; /* number of pages to be retrieved */
};
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