On Fri, Mar 01, 2019 at 06:58:32PM +0300, Alexey Budankov wrote: SNIP
> > /* > * Increment md->refcount to guard md->data[idx] buffer > @@ -350,7 +357,7 @@ int perf_mmap__aio_push(struct perf_mmap *md, void *to, > int idx, > md->prev = head; > perf_mmap__consume(md); > > - rc = push(to, &md->aio.cblocks[idx], md->aio.data[idx], size0 + size, > *off); > + rc = push(to, md->aio.data[idx], size0 + size, *off, > &md->aio.cblocks[idx]); > if (!rc) { > *off += size0 + size; > } else { > @@ -556,13 +563,15 @@ int perf_mmap__read_init(struct perf_mmap *map) > } > > int perf_mmap__push(struct perf_mmap *md, void *to, > - int push(struct perf_mmap *map, void *to, void *buf, size_t > size)) > + int push(struct perf_mmap *map, void *to, void *buf, size_t > size), > + perf_mmap__compress_fn_t compress, void *comp_data) > { > u64 head = perf_mmap__read_head(md); > unsigned char *data = md->base + page_size; > unsigned long size; > void *buf; > int rc = 0; > + size_t mmap_len = perf_mmap__mmap_len(md); > > rc = perf_mmap__read_init(md); > if (rc < 0) > @@ -574,7 +583,10 @@ int perf_mmap__push(struct perf_mmap *md, void *to, > buf = &data[md->start & md->mask]; > size = md->mask + 1 - (md->start & md->mask); > md->start += size; > - > + if (compress) { > + size = compress(comp_data, md->data, mmap_len, buf, > size); > + buf = md->data; > + } > if (push(md, to, buf, size) < 0) { > rc = -1; > goto out; when we discussed the compress callback should be another layer in perf_mmap__push I was thinking more of the layered/fifo design, like: normaly we call: perf_mmap__push(... push = record__pushfn ...) -> reads mmap data and calls push(data), which translates as: record__pushfn(data); - which stores the data for compressed it'd be: perf_mmap__push(... push = compressed_push ...) -> reads mmap data and calls push(data), which translates as: compressed_push(data) -> reads data, compresses them and calls, next push callback in line: record__pushfn(data) - which stores the data there'd need to be the logic for compressed_push to remember the 'next push' function but I think this was the original idea behind the perf_mmap__push -> it gets the data and pushes them for the next processing.. it should stay as simple as that jirka