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Registered in England and Wales under Company Registration No. 3798903 Subject: [RFC PATCH 37/61] cachefiles: Add I/O tracepoints From: David Howells To: Trond Myklebust , Anna Schumaker , Steve French , Jeff Layton Cc: dhowells@redhat.com, Matthew Wilcox , Alexander Viro , 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 Date: Mon, 04 May 2020 18:13:06 +0100 Message-ID: <158861238642.340223.8962664382713166792.stgit@warthog.procyon.org.uk> In-Reply-To: <158861203563.340223.7585359869938129395.stgit@warthog.procyon.org.uk> References: <158861203563.340223.7585359869938129395.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.21 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.13 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org --- fs/cachefiles/interface.c | 16 +++-- fs/cachefiles/io.c | 2 + include/trace/events/cachefiles.h | 123 +++++++++++++++++++++++++++++++++++++ 3 files changed, 136 insertions(+), 5 deletions(-) diff --git a/fs/cachefiles/interface.c b/fs/cachefiles/interface.c index aa063857272a..feff39dff0f5 100644 --- a/fs/cachefiles/interface.c +++ b/fs/cachefiles/interface.c @@ -160,7 +160,8 @@ static void cachefiles_update_object(struct fscache_object *_object) struct cachefiles_object *object; struct cachefiles_cache *cache; const struct cred *saved_cred; - loff_t object_size; + struct inode *inode; + loff_t object_size, i_size; int ret; _enter("{OBJ%x}", _object->debug_id); @@ -172,12 +173,15 @@ static void cachefiles_update_object(struct fscache_object *_object) cachefiles_begin_secure(cache, &saved_cred); object_size = object->fscache.cookie->object_size; - if (i_size_read(d_inode(object->dentry)) > object_size) { + inode = d_inode(object->dentry); + i_size = i_size_read(inode); + if (i_size > object_size) { struct path path = { .mnt = cache->mnt, .dentry = object->dentry }; - _debug("trunc %llx -> %llx", i_size_read(d_inode(object->dentry)), object_size); + _debug("trunc %llx -> %llx", i_size, object_size); + trace_cachefiles_trunc(object, inode, i_size, object_size); ret = vfs_truncate(&path, object_size); if (ret < 0) { cachefiles_io_error_obj(object, "Trunc-to-size failed"); @@ -186,8 +190,10 @@ static void cachefiles_update_object(struct fscache_object *_object) } object_size = round_up(object_size, CACHEFILES_DIO_BLOCK_SIZE); - _debug("trunc %llx -> %llx", i_size_read(d_inode(object->dentry)), object_size); - if (i_size_read(d_inode(object->dentry)) < object_size) { + i_size = i_size_read(inode); + _debug("trunc %llx -> %llx", i_size, object_size); + if (i_size < object_size) { + trace_cachefiles_trunc(object, inode, i_size, object_size); ret = vfs_truncate(&path, object_size); if (ret < 0) { cachefiles_io_error_obj(object, "Trunc-to-dio-size failed"); diff --git a/fs/cachefiles/io.c b/fs/cachefiles/io.c index 42e0d620d778..268e6f69ba9c 100644 --- a/fs/cachefiles/io.c +++ b/fs/cachefiles/io.c @@ -88,6 +88,7 @@ int cachefiles_read(struct fscache_object *obj, goto presubmission_error_free; fscache_get_io_request(req); + trace_cachefiles_read(object, file_inode(file), req); ret = call_read_iter(file, &ki->iocb, iter); switch (ret) { case -EIOCBQUEUED: @@ -198,6 +199,7 @@ int cachefiles_write(struct fscache_object *obj, __sb_writers_release(inode->i_sb, SB_FREEZE_WRITE); fscache_get_io_request(req); + trace_cachefiles_write(object, inode, req); ret = call_write_iter(file, &ki->iocb, iter); switch (ret) { case -EIOCBQUEUED: diff --git a/include/trace/events/cachefiles.h b/include/trace/events/cachefiles.h index e7af1d683009..d83568e8fee8 100644 --- a/include/trace/events/cachefiles.h +++ b/include/trace/events/cachefiles.h @@ -351,6 +351,129 @@ TRACE_EVENT(cachefiles_coherency, __entry->content) ); +TRACE_EVENT(cachefiles_read, + TP_PROTO(struct cachefiles_object *obj, + struct inode *backer, + struct fscache_io_request *req), + + TP_ARGS(obj, backer, req), + + TP_STRUCT__entry( + __field(unsigned int, obj ) + __field(unsigned int, backer ) + __field(unsigned int, len ) + __field(loff_t, pos ) + ), + + TP_fast_assign( + __entry->obj = obj->fscache.debug_id; + __entry->backer = backer->i_ino; + __entry->pos = req->pos; + __entry->len = req->len; + ), + + TP_printk("o=%08x b=%08x p=%llx l=%x", + __entry->obj, + __entry->backer, + __entry->pos, + __entry->len) + ); + +TRACE_EVENT(cachefiles_write, + TP_PROTO(struct cachefiles_object *obj, + struct inode *backer, + struct fscache_io_request *req), + + TP_ARGS(obj, backer, req), + + TP_STRUCT__entry( + __field(unsigned int, obj ) + __field(unsigned int, backer ) + __field(unsigned int, len ) + __field(loff_t, pos ) + ), + + TP_fast_assign( + __entry->obj = obj->fscache.debug_id; + __entry->backer = backer->i_ino; + __entry->pos = req->pos; + __entry->len = req->len; + ), + + TP_printk("o=%08x b=%08x p=%llx l=%x", + __entry->obj, + __entry->backer, + __entry->pos, + __entry->len) + ); + +TRACE_EVENT(cachefiles_trunc, + TP_PROTO(struct cachefiles_object *obj, struct inode *backer, + loff_t from, loff_t to), + + TP_ARGS(obj, backer, from, to), + + TP_STRUCT__entry( + __field(unsigned int, obj ) + __field(unsigned int, backer ) + __field(loff_t, from ) + __field(loff_t, to ) + ), + + TP_fast_assign( + __entry->obj = obj->fscache.debug_id; + __entry->backer = backer->i_ino; + __entry->from = from; + __entry->to = to; + ), + + TP_printk("o=%08x b=%08x l=%llx->%llx", + __entry->obj, + __entry->backer, + __entry->from, + __entry->to) + ); + +TRACE_EVENT(cachefiles_tmpfile, + TP_PROTO(struct cachefiles_object *obj, struct inode *backer), + + TP_ARGS(obj, backer), + + TP_STRUCT__entry( + __field(unsigned int, obj ) + __field(unsigned int, backer ) + ), + + TP_fast_assign( + __entry->obj = obj->fscache.debug_id; + __entry->backer = backer->i_ino; + ), + + TP_printk("o=%08x b=%08x", + __entry->obj, + __entry->backer) + ); + +TRACE_EVENT(cachefiles_link, + TP_PROTO(struct cachefiles_object *obj, struct inode *backer), + + TP_ARGS(obj, backer), + + TP_STRUCT__entry( + __field(unsigned int, obj ) + __field(unsigned int, backer ) + ), + + TP_fast_assign( + __entry->obj = obj->fscache.debug_id; + __entry->backer = backer->i_ino; + ), + + TP_printk("o=%08x b=%08x", + __entry->obj, + __entry->backer) + ); + #endif /* _TRACE_CACHEFILES_H */ /* This part must be outside protection */