On Tue, Oct 01, 2019 at 09:11:42AM +0200, Christoph Hellwig wrote: > Lift the xfs code for tracing address space operations to the iomap > layer. > > Signed-off-by: Christoph Hellwig <hch@xxxxxx> > --- > fs/iomap/buffered-io.c | 7 +++++++ > include/trace/events/iomap.h | 27 +++++++++++++++++++++++++++ > 2 files changed, 34 insertions(+) > create mode 100644 include/trace/events/iomap.h > > diff --git a/fs/iomap/buffered-io.c b/fs/iomap/buffered-io.c > index e25901ae3ff4..099daf0c09b8 100644 > --- a/fs/iomap/buffered-io.c > +++ b/fs/iomap/buffered-io.c > @@ -19,6 +19,9 @@ > > #include "../internal.h" > > +#define CREATE_TRACE_POINTS > +#include <trace/events/iomap.h> > + > static struct iomap_page * > iomap_page_create(struct inode *inode, struct page *page) > { > @@ -293,6 +296,8 @@ iomap_readpage(struct page *page, const struct iomap_ops *ops) > unsigned poff; > loff_t ret; > > + trace_iomap_readpage(page->mapping->host, 1); > + > for (poff = 0; poff < PAGE_SIZE; poff += ret) { > ret = iomap_apply(inode, page_offset(page) + poff, > PAGE_SIZE - poff, 0, ops, &ctx, > @@ -389,6 +394,8 @@ iomap_readpages(struct address_space *mapping, struct list_head *pages, > loff_t last = page_offset(list_entry(pages->next, struct page, lru)); > loff_t length = last - pos + PAGE_SIZE, ret = 0; > > + trace_iomap_readpages(mapping->host, nr_pages); > + > while (length > 0) { > ret = iomap_apply(mapping->host, pos, length, 0, ops, > &ctx, iomap_readpages_actor); > diff --git a/include/trace/events/iomap.h b/include/trace/events/iomap.h > new file mode 100644 > index 000000000000..7d2fe2c773f3 > --- /dev/null > +++ b/include/trace/events/iomap.h ...and I guess while we're bikeshedding over tracepoints, why not put this in fs/iomap/trace.h ? Do you anticipate anyone outside of iomap needing to access the tracepoint declarations? --D > @@ -0,0 +1,27 @@ > +// SPDX-License-Identifier: GPL-2.0 > +/* > + * Copyright (c) 2009-2019, Christoph Hellwig > + * All Rights Reserved. > + * > + * NOTE: none of these tracepoints shall be consider a stable kernel ABI > + * as they can change at any time. > + */ > +#undef TRACE_SYSTEM > +#define TRACE_SYSTEM iomap > + > +#if !defined(_TRACE_IOMAP_H) || defined(TRACE_HEADER_MULTI_READ) > +#define _TRACE_IOMAP_H > + > +#include <linux/tracepoint.h> > + > +#define DEFINE_READPAGE_EVENT(name) \ > +DEFINE_EVENT(iomap_readpage_class, name, \ > + TP_PROTO(struct inode *inode, int nr_pages), \ > + TP_ARGS(inode, nr_pages)) > +DEFINE_READPAGE_EVENT(iomap_readpage); > +DEFINE_READPAGE_EVENT(iomap_readpages); > + > +#endif /* _TRACE_IOMAP_H */ > + > +/* This part must be outside protection */ > +#include <trace/define_trace.h> > -- > 2.20.1 >