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From: David Howells <dhowells@redhat.com>
To: Trond Myklebust <trondmy@hammerspace.com>,
	Anna Schumaker <anna.schumaker@netapp.com>,
	Steve French <sfrench@samba.org>,
	Dominique Martinet <asmadeus@codewreck.org>
Cc: dhowells@redhat.com, Jeff Layton <jlayton@redhat.com>,
	Matthew Wilcox <willy@infradead.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	linux-cachefs@redhat.com, linux-afs@lists.infradead.org,
	linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org,
	ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net,
	linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: [RFC PATCH 50/76] fscache: New stats
Date: Fri, 20 Nov 2020 15:13:15 +0000
Message-ID: <160588519591.3465195.13700401271599881928.stgit@warthog.procyon.org.uk> (raw)
In-Reply-To: <160588455242.3465195.3214733858273019178.stgit@warthog.procyon.org.uk>

Create some new stat counters appropriate to the reworked code.

Signed-off-by: David Howells <dhowells@redhat.com>
---

 fs/cachefiles/io.c            |    2 ++
 fs/fscache/Kconfig            |    1 +
 fs/fscache/dispatcher.c       |    6 ++++++
 fs/fscache/internal.h         |    8 ++++++--
 fs/fscache/stats.c            |   27 ++++++++++++++++++++++++---
 include/linux/fscache-cache.h |   10 ++++++++++
 6 files changed, 49 insertions(+), 5 deletions(-)

diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c
index c9866bd5e010..1060c1c57008 100644
--- a/fs/cachefiles/io.c
+++ b/fs/cachefiles/io.c
@@ -84,6 +84,7 @@ int cachefiles_read(struct fscache_op_resources *opr,
 
 	__fscache_wait_for_operation(opr, FSCACHE_WANT_READ);
 	fscache_count_io_operation(opr->object->cookie);
+	fscache_count_read();
 
 	/* If the caller asked us to seek for data before doing the read, then
 	 * we should do that now.  If we find a gap, we fill it with zeros.
@@ -233,6 +234,7 @@ int cachefiles_write(struct fscache_op_resources *opr,
 
 	__fscache_wait_for_operation(opr, FSCACHE_WANT_WRITE);
 	fscache_count_io_operation(opr->object->cookie);
+	fscache_count_write();
 
 	ki = kzalloc(sizeof(struct cachefiles_kiocb), GFP_KERNEL);
 	if (!ki)
diff --git a/fs/fscache/Kconfig b/fs/fscache/Kconfig
index b04f07160e5e..fe7f856a4037 100644
--- a/fs/fscache/Kconfig
+++ b/fs/fscache/Kconfig
@@ -14,6 +14,7 @@ config FSCACHE
 config FSCACHE_STATS
 	bool "Gather statistical information on local caching"
 	depends on FSCACHE && PROC_FS
+	select NETFS_STATS
 	help
 	  This option causes statistical information to be gathered on local
 	  caching and exported through file:
diff --git a/fs/fscache/dispatcher.c b/fs/fscache/dispatcher.c
index 3d957e499da3..2663bd4b36e8 100644
--- a/fs/fscache/dispatcher.c
+++ b/fs/fscache/dispatcher.c
@@ -41,6 +41,8 @@ void fscache_dispatch(struct fscache_cookie *cookie,
 	struct fscache_work *work;
 	bool queued = false;
 
+	fscache_stat(&fscache_n_dispatch_count);
+
 	work = kzalloc(sizeof(struct fscache_work), GFP_KERNEL);
 	if (work) {
 		work->cookie = cookie;
@@ -57,10 +59,13 @@ void fscache_dispatch(struct fscache_cookie *cookie,
 			queued = true;
 		}
 		spin_unlock(&fscache_work_lock);
+		if (queued)
+			fscache_stat(&fscache_n_dispatch_deferred);
 	}
 
 	if (!queued) {
 		kfree(work);
+		fscache_stat(&fscache_n_dispatch_inline);
 		func(cookie, object, param);
 	}
 }
@@ -86,6 +91,7 @@ static int fscache_dispatcher(void *data)
 
 			if (work) {
 				work->func(work->cookie, work->object, work->param);
+				fscache_stat(&fscache_n_dispatch_in_pool);
 				fscache_cookie_put(work->cookie, fscache_cookie_put_work);
 				kfree(work);
 			}
diff --git a/fs/fscache/internal.h b/fs/fscache/internal.h
index 1721823b8cac..73568e84fe3d 100644
--- a/fs/fscache/internal.h
+++ b/fs/fscache/internal.h
@@ -221,6 +221,11 @@ extern atomic_t fscache_n_cache_stale_objects;
 extern atomic_t fscache_n_cache_retired_objects;
 extern atomic_t fscache_n_cache_culled_objects;
 
+extern atomic_t fscache_n_dispatch_count;
+extern atomic_t fscache_n_dispatch_deferred;
+extern atomic_t fscache_n_dispatch_inline;
+extern atomic_t fscache_n_dispatch_in_pool;
+
 static inline void fscache_stat(atomic_t *stat)
 {
 	atomic_inc(stat);
@@ -233,10 +238,9 @@ static inline void fscache_stat_d(atomic_t *stat)
 
 #define __fscache_stat(stat) (stat)
 
-int fscache_stats_show(struct seq_file *m, void *v);
 extern int __init fscache_proc_stats_init(void);
-#else
 
+#else
 #define __fscache_stat(stat) (NULL)
 #define fscache_stat(stat) do {} while (0)
 #define fscache_stat_d(stat) do {} while (0)
diff --git a/fs/fscache/stats.c b/fs/fscache/stats.c
index bf2935571de5..952214305853 100644
--- a/fs/fscache/stats.c
+++ b/fs/fscache/stats.c
@@ -6,9 +6,9 @@
  */
 
 #define FSCACHE_DEBUG_LEVEL CACHE
-#include <linux/module.h>
 #include <linux/proc_fs.h>
 #include <linux/seq_file.h>
+#include <linux/netfs.h>
 #include "internal.h"
 
 /*
@@ -56,13 +56,22 @@ atomic_t fscache_n_cache_stale_objects;
 atomic_t fscache_n_cache_retired_objects;
 atomic_t fscache_n_cache_culled_objects;
 
+atomic_t fscache_n_dispatch_count;
+atomic_t fscache_n_dispatch_deferred;
+atomic_t fscache_n_dispatch_inline;
+atomic_t fscache_n_dispatch_in_pool;
+
+atomic_t fscache_n_read;
+EXPORT_SYMBOL(fscache_n_read);
+atomic_t fscache_n_write;
+EXPORT_SYMBOL(fscache_n_write);
+
 /*
  * display the general statistics
  */
-int fscache_stats_show(struct seq_file *m, void *v)
+static int fscache_stats_show(struct seq_file *m, void *v)
 {
 	seq_puts(m, "FS-Cache statistics\n");
-
 	seq_printf(m, "Cookies: idx=%u dat=%u spc=%u\n",
 		   atomic_read(&fscache_n_cookie_index),
 		   atomic_read(&fscache_n_cookie_data),
@@ -113,6 +122,18 @@ int fscache_stats_show(struct seq_file *m, void *v)
 		   atomic_read(&fscache_n_cache_stale_objects),
 		   atomic_read(&fscache_n_cache_retired_objects),
 		   atomic_read(&fscache_n_cache_culled_objects));
+
+	seq_printf(m, "Disp   : n=%u il=%u df=%u pl=%u\n",
+		   atomic_read(&fscache_n_dispatch_count),
+		   atomic_read(&fscache_n_dispatch_inline),
+		   atomic_read(&fscache_n_dispatch_deferred),
+		   atomic_read(&fscache_n_dispatch_in_pool));
+
+	seq_printf(m, "IO     : rd=%u wr=%u\n",
+		   atomic_read(&fscache_n_read),
+		   atomic_read(&fscache_n_write));
+
+	netfs_stats_show(m);
 	return 0;
 }
 
diff --git a/include/linux/fscache-cache.h b/include/linux/fscache-cache.h
index 54625464a109..dacfda1d3c20 100644
--- a/include/linux/fscache-cache.h
+++ b/include/linux/fscache-cache.h
@@ -259,4 +259,14 @@ static inline void fscache_uncount_io_operation(struct fscache_cookie *cookie)
 extern void __fscache_wait_for_operation(struct fscache_op_resources *, enum fscache_want_stage);
 extern void __fscache_end_operation(struct fscache_op_resources *);
 
+#ifdef CONFIG_FSCACHE_STATS
+extern atomic_t fscache_n_read;
+extern atomic_t fscache_n_write;
+#define fscache_count_read() atomic_inc(&fscache_n_read)
+#define fscache_count_write() atomic_inc(&fscache_n_write)
+#else
+#define fscache_count_read() do {} while(0)
+#define fscache_count_write() do {} while(0)
+#endif
+
 #endif /* _LINUX_FSCACHE_CACHE_H */



  parent reply index

Thread overview: 76+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-20 15:02 [RFC PATCH 00/76] fscache: Modernisation David Howells
2020-11-20 15:02 ` [RFC PATCH 01/76] nfs, cifs, ceph, 9p: Disable use of fscache prior to its rewrite David Howells
2020-11-20 15:02 ` [RFC PATCH 02/76] afs: Disable use of the fscache I/O routines David Howells
2020-11-20 15:03 ` [RFC PATCH 03/76] fscache: Add a cookie debug ID and use that in traces David Howells
2020-11-20 15:03 ` [RFC PATCH 04/76] fscache: Procfile to display cookies David Howells
2020-11-20 15:03 ` [RFC PATCH 05/76] fscache: Remove the old I/O API David Howells
2020-11-20 15:03 ` [RFC PATCH 06/76] fscache: Remove the netfs data from the cookie David Howells
2020-11-20 15:04 ` [RFC PATCH 07/76] fscache: Remove struct fscache_cookie_def David Howells
2020-11-20 15:04 ` [RFC PATCH 08/76] fscache: Remove store_limit* from struct fscache_object David Howells
2020-11-20 15:04 ` [RFC PATCH 09/76] fscache: Remove fscache_check_consistency() David Howells
2020-11-20 15:04 ` [RFC PATCH 10/76] fscache: Remove fscache_attr_changed() David Howells
2020-11-20 15:04 ` [RFC PATCH 11/76] fscache: Remove obsolete stats David Howells
2020-11-20 15:05 ` [RFC PATCH 12/76] fscache: Remove old I/O tracepoints David Howells
2020-11-20 15:05 ` [RFC PATCH 13/76] fscache: Temporarily disable fscache_invalidate() David Howells
2020-11-20 15:05 ` [RFC PATCH 14/76] fscache: Remove the I/O operation manager David Howells
2020-11-20 15:05 ` [RFC PATCH 15/76] fscache: Change %p in format strings to something else David Howells
2020-11-20 15:06 ` [RFC PATCH 16/76] cachefiles: " David Howells
2020-11-20 15:06 ` [RFC PATCH 17/76] iov_iter: Add ITER_XARRAY David Howells
2020-11-20 15:06 ` [RFC PATCH 18/76] vm: Add wait/unlock functions for PG_fscache David Howells
2020-11-20 15:06 ` [RFC PATCH 19/76] mm: Implement readahead_control pageset expansion David Howells
2020-11-20 15:06 ` [RFC PATCH 20/76] mm: Stop generic_file_buffered_read() from grabbing a superfluous page David Howells
2020-11-20 15:07 ` [RFC PATCH 21/76] vfs: Export rw_verify_area() for use by cachefiles David Howells
2020-11-20 15:07 ` [RFC PATCH 22/76] vfs: Provide S_CACHE_FILE inode flag David Howells
2020-11-20 15:07 ` [RFC PATCH 23/76] cachefiles: Remove tree of active files and use " David Howells
2020-11-20 15:07 ` [RFC PATCH 24/76] fscache: Provide a simple thread pool for running ops asynchronously David Howells
2020-11-20 15:08 ` [RFC PATCH 26/76] fscache: Rewrite the I/O API based on iov_iter David Howells
2020-11-20 15:08 ` [RFC PATCH 27/76] fscache: Keep track of size of a file last set independently on the server David Howells
2020-11-20 15:08 ` [RFC PATCH 28/76] fscache, cachefiles: Fix disabled histogram warnings David Howells
2020-11-20 15:08 ` [RFC PATCH 29/76] fscache: Recast assertion in terms of cookie not being an index David Howells
2020-11-20 15:08 ` [RFC PATCH 30/76] vfs, fscache: Force ->write_inode() to occur if cookie pinned for writeback David Howells
2020-11-20 15:09 ` [RFC PATCH 31/76] fscache: Allow ->put_super() to be used to wait for cache operations David Howells
2020-11-20 15:09 ` [RFC PATCH 32/76] netfs: Make a netfs helper module David Howells
2020-11-20 15:09 ` [RFC PATCH 33/76] netfs: Provide readahead and readpage netfs helpers David Howells
2020-11-20 15:09 ` [RFC PATCH 34/76] netfs: Use the cache David Howells
2020-11-20 15:10 ` [RFC PATCH 35/76] fscache: read-helper: Add tracepoints David Howells
2020-11-20 15:10 ` [RFC PATCH 36/76] cachefiles: Remove some redundant checks on unsigned values David Howells
2020-11-20 15:10 ` [RFC PATCH 37/76] cachefiles: trace: Log coherency checks David Howells
2020-11-20 15:10 ` [RFC PATCH 38/76] cachefiles: Split cachefiles_drop_object() up a bit David Howells
2020-11-20 15:11 ` [RFC PATCH 39/76] cachefiles: Implement new fscache I/O backend API David Howells
2020-11-20 15:11 ` [RFC PATCH 40/76] cachefiles: Merge object->backer into object->dentry David Howells
2020-11-20 15:11 ` [RFC PATCH 41/76] cachefiles: Implement a content-present indicator and bitmap David Howells
2020-11-20 15:11 ` [RFC PATCH 42/76] cachefiles: Shape requests from the fscache read helper David Howells
2020-11-20 15:11 ` [RFC PATCH 43/76] cachefiles: Round the cachefile size up to DIO block size David Howells
2020-11-20 15:12 ` [RFC PATCH 44/76] cachefiles: Implement read and write parts of new I/O API David Howells
2020-11-20 15:12 ` [RFC PATCH 45/76] cachefiles: Add I/O tracepoints David Howells
2020-11-20 15:12 ` [RFC PATCH 46/76] fscache: Display cache-specific data in /proc/fs/fscache/objects David Howells
2020-11-20 15:12 ` [RFC PATCH 47/76] fscache: Remove more obsolete stats David Howells
2020-11-20 15:12 ` [RFC PATCH 48/76] fscache: Always create /proc/fs/fscache/stats if configured David Howells
2020-11-20 15:13 ` [RFC PATCH 49/76] netfs: Stats David Howells
2020-11-20 15:13 ` David Howells [this message]
2020-11-20 15:13 ` [RFC PATCH 51/76] fscache, cachefiles: Rewrite invalidation David Howells
2020-11-20 15:13 ` [RFC PATCH 52/76] fscache: disable cookie when doing an invalidation for DIO write David Howells
2020-11-20 15:13 ` [RFC PATCH 53/76] fscache: Implement "will_modify" parameter on fscache_use_cookie() David Howells
2020-11-20 15:14 ` [RFC PATCH 54/76] fscache: Provide resize operation David Howells
2020-11-20 15:14 ` [RFC PATCH 55/76] fscache: Remove the update operation David Howells
2020-11-20 15:14 ` [RFC PATCH 56/76] afs: Pass page into dirty region helpers to provide THP size David Howells
2020-11-20 15:14 ` [RFC PATCH 57/76] afs: Print the operation debug_id when logging an unexpected data version David Howells
2020-11-20 15:14 ` [RFC PATCH 58/76] afs: Move key to afs_read struct David Howells
2020-11-20 15:15 ` [RFC PATCH 59/76] afs: Don't truncate iter during data fetch David Howells
2020-11-20 15:15 ` [RFC PATCH 60/76] afs: Log remote unmarshalling errors David Howells
2020-11-20 15:15 ` [RFC PATCH 61/76] afs: Set up the iov_iter before calling afs_extract_data() David Howells
2020-11-20 15:15 ` [RFC PATCH 62/76] afs: Use ITER_XARRAY for writing David Howells
2020-11-20 15:16 ` [RFC PATCH 63/76] afs: Wait on PG_fscache before modifying/releasing a page David Howells
2020-11-20 15:16 ` [RFC PATCH 64/76] afs: Extract writeback extension into its own function David Howells
2020-11-20 15:16 ` [RFC PATCH 65/76] afs: Prepare for use of THPs David Howells
2020-11-20 15:16 ` [RFC PATCH 66/76] afs: Use the fs operation ops to handle FetchData completion David Howells
2020-11-20 15:17 ` [RFC PATCH 67/76] afs: Use new fscache read helper API David Howells
2020-11-20 15:17 ` [RFC PATCH 68/76] netfs: Add write_begin helper David Howells
2020-11-20 15:17 ` [RFC PATCH 69/76] fscache: Add support for writing to the cache David Howells
2020-11-20 15:17 ` [RFC PATCH 70/76] afs: Use the fscache_write_begin() helper David Howells
2020-11-20 15:18 ` [RFC PATCH 71/76] afs: Copy local writes to the cache when writing to the server David Howells
2020-11-20 15:18 ` [RFC PATCH 72/76] afs: Invoke fscache_resize_cookie() when handling ATTR_SIZE for setattr David Howells
2020-11-20 15:18 ` [RFC PATCH 73/76] afs: Add O_DIRECT read support David Howells
2020-11-20 15:18 ` [RFC PATCH 74/76] afs: Skip truncation on the server of data we haven't written yet David Howells
2020-11-20 15:19 ` [RFC PATCH 75/76] afs: Make afs_write_begin() return the THP subpage David Howells
2020-11-20 15:19 ` [RFC PATCH 76/76] afs: Fix speculative status fetch going out of order wrt to modifications David Howells

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