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perf dso: Add dso__data_write_cache_addr()

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Add functions to write into the dso file data cache, but not change the
file itself.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Leo Yan <leo.yan@linaro.org>
Cc: Mark Rutland <mark.rutland@arm.com>
Cc: Mathieu Poirier <mathieu.poirier@linaro.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: x86@kernel.org
Link: http://lore.kernel.org/lkml/20191025130000.13032-4-adrian.hunter@intel.com
Signed-off-by: Arnaldo Carvalho de Melo <acme@redhat.com>
This commit is contained in:
Adrian Hunter 2019-10-25 15:59:57 +03:00 committed by Arnaldo Carvalho de Melo
parent 366df72657
commit b86a9d918a
2 changed files with 65 additions and 15 deletions
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73
tools/perf/util/dso.c
View File

@ -827,14 +827,16 @@ out:
return cache;
}
static ssize_t
dso_cache__memcpy(struct dso_cache *cache, u64 offset,
u8 *data, u64 size)
static ssize_t dso_cache__memcpy(struct dso_cache *cache, u64 offset, u8 *data,
u64 size, bool out)
{
u64 cache_offset = offset - cache->offset;
u64 cache_size = min(cache->size - cache_offset, size);
memcpy(data, cache->data + cache_offset, cache_size);
if (out)
memcpy(data, cache->data + cache_offset, cache_size);
else
memcpy(cache->data + cache_offset, data, cache_size);
return cache_size;
}
@ -910,8 +912,8 @@ static struct dso_cache *dso_cache__find(struct dso *dso,
return cache ? cache : dso_cache__populate(dso, machine, offset, ret);
}
static ssize_t dso_cache_read(struct dso *dso, struct machine *machine,
u64 offset, u8 *data, ssize_t size)
static ssize_t dso_cache_io(struct dso *dso, struct machine *machine,
u64 offset, u8 *data, ssize_t size, bool out)
{
struct dso_cache *cache;
ssize_t ret = 0;
@ -920,16 +922,16 @@ static ssize_t dso_cache_read(struct dso *dso, struct machine *machine,
if (!cache)
return ret;
return dso_cache__memcpy(cache, offset, data, size);
return dso_cache__memcpy(cache, offset, data, size, out);
}
/*
* Reads and caches dso data DSO__DATA_CACHE_SIZE size chunks
* in the rb_tree. Any read to already cached data is served
* by cached data.
* by cached data. Writes update the cache only, not the backing file.
*/
static ssize_t cached_read(struct dso *dso, struct machine *machine,
u64 offset, u8 *data, ssize_t size)
static ssize_t cached_io(struct dso *dso, struct machine *machine,
u64 offset, u8 *data, ssize_t size, bool out)
{
ssize_t r = 0;
u8 *p = data;
@ -937,7 +939,7 @@ static ssize_t cached_read(struct dso *dso, struct machine *machine,
do {
ssize_t ret;
ret = dso_cache_read(dso, machine, offset, p, size);
ret = dso_cache_io(dso, machine, offset, p, size, out);
if (ret < 0)
return ret;
@ -1021,8 +1023,9 @@ off_t dso__data_size(struct dso *dso, struct machine *machine)
return dso->data.file_size;
}
static ssize_t data_read_offset(struct dso *dso, struct machine *machine,
u64 offset, u8 *data, ssize_t size)
static ssize_t data_read_write_offset(struct dso *dso, struct machine *machine,
u64 offset, u8 *data, ssize_t size,
bool out)
{
if (dso__data_file_size(dso, machine))
return -1;
@ -1034,7 +1037,7 @@ static ssize_t data_read_offset(struct dso *dso, struct machine *machine,
if (offset + size < offset)
return -1;
return cached_read(dso, machine, offset, data, size);
return cached_io(dso, machine, offset, data, size, out);
}
/**
@ -1054,7 +1057,7 @@ ssize_t dso__data_read_offset(struct dso *dso, struct machine *machine,
if (dso->data.status == DSO_DATA_STATUS_ERROR)
return -1;
return data_read_offset(dso, machine, offset, data, size);
return data_read_write_offset(dso, machine, offset, data, size, true);
}
/**
@ -1075,6 +1078,46 @@ ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
return dso__data_read_offset(dso, machine, offset, data, size);
}
/**
* dso__data_write_cache_offs - Write data to dso data cache at file offset
* @dso: dso object
* @machine: machine object
* @offset: file offset
* @data: buffer to write
* @size: size of the @data buffer
*
* Write into the dso file data cache, but do not change the file itself.
*/
ssize_t dso__data_write_cache_offs(struct dso *dso, struct machine *machine,
u64 offset, const u8 *data_in, ssize_t size)
{
u8 *data = (u8 *)data_in; /* cast away const to use same fns for r/w */
if (dso->data.status == DSO_DATA_STATUS_ERROR)
return -1;
return data_read_write_offset(dso, machine, offset, data, size, false);
}
/**
* dso__data_write_cache_addr - Write data to dso data cache at dso address
* @dso: dso object
* @machine: machine object
* @add: virtual memory address
* @data: buffer to write
* @size: size of the @data buffer
*
* External interface to write into the dso file data cache, but do not change
* the file itself.
*/
ssize_t dso__data_write_cache_addr(struct dso *dso, struct map *map,
struct machine *machine, u64 addr,
const u8 *data, ssize_t size)
{
u64 offset = map->map_ip(map, addr);
return dso__data_write_cache_offs(dso, machine, offset, data, size);
}
struct map *dso__new_map(const char *name)
{
struct map *map = NULL;

7
tools/perf/util/dso.h
View File

@ -285,6 +285,8 @@ void dso__set_module_info(struct dso *dso, struct kmod_path *m,
* dso__data_size
* dso__data_read_offset
* dso__data_read_addr
* dso__data_write_cache_offs
* dso__data_write_cache_addr
*
* Please refer to the dso.c object code for each function and
* arguments documentation. Following text tries to explain the
@ -332,6 +334,11 @@ ssize_t dso__data_read_addr(struct dso *dso, struct map *map,
struct machine *machine, u64 addr,
u8 *data, ssize_t size);
bool dso__data_status_seen(struct dso *dso, enum dso_data_status_seen by);
ssize_t dso__data_write_cache_offs(struct dso *dso, struct machine *machine,
u64 offset, const u8 *data, ssize_t size);
ssize_t dso__data_write_cache_addr(struct dso *dso, struct map *map,
struct machine *machine, u64 addr,
const u8 *data, ssize_t size);
struct map *dso__new_map(const char *name);
struct dso *machine__findnew_kernel(struct machine *machine, const char *name,