From b4c11c139717729b8257ee9382d4e5ed713d4dde Mon Sep 17 00:00:00 2001 From: Denys Vlasenko Date: Sun, 7 Dec 2014 00:44:00 +0100 Subject: libarchive: add capability to unpack to mem.buffer The performance and number of processes for a "depmod -a" with gzipped modules was abysmal. This patch adds a code path without fork, benefiting all users of xmalloc_open_zipped_read_close. "modinfo radeon.ko.gz", a single-file reader, got 30% faster. "depmod -a", which used to fork over 800 times, got 20% faster. Heavily based on a patch by Lauri Kasanen function old new delta setup_transformer_on_fd - 159 +159 transformer_write - 122 +122 fork_transformer - 112 +112 xmalloc_open_zipped_read_close 63 118 +55 read_bunzip 1866 1896 +30 xtransformer_write - 19 +19 unzip_main 2449 2462 +13 bbunpack 755 766 +11 unpack_lzma_stream 2717 2723 +6 unpack_xz_stream 2393 2397 +4 unpack_Z_stream 1173 1175 +2 inflate_unzip 111 105 -6 check_signature16 70 63 -7 unpack_bz2_stream 359 349 -10 unpack_unxz 12 - -12 unpack_unlzma 12 - -12 unpack_uncompress 12 - -12 unpack_gunzip 12 - -12 unpack_bunzip2 12 - -12 open_transformer 106 92 -14 inflate_unzip_internal 1945 1916 -29 unpack_gz_stream 693 655 -38 open_zipped 89 47 -42 setup_unzip_on_fd 142 53 -89 ------------------------------------------------------------------------------ (add/remove: 4/5 grow/shrink: 7/8 up/down: 533/-295) Total: 238 bytes Signed-off-by: Denys Vlasenko --- archival/libarchive/decompress_unxz.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) (limited to 'archival/libarchive/decompress_unxz.c') diff --git a/archival/libarchive/decompress_unxz.c b/archival/libarchive/decompress_unxz.c index 6df54e131..1f408abfd 100644 --- a/archival/libarchive/decompress_unxz.c +++ b/archival/libarchive/decompress_unxz.c @@ -38,7 +38,7 @@ static uint32_t xz_crc32(const uint8_t *buf, size_t size, uint32_t crc) #include "unxz/xz_dec_stream.c" IF_DESKTOP(long long) int FAST_FUNC -unpack_xz_stream(transformer_state_t *xstate, int src_fd, int dst_fd) +unpack_xz_stream(transformer_state_t *xstate) { enum xz_ret xz_result; struct xz_buf iobuf; @@ -67,7 +67,7 @@ unpack_xz_stream(transformer_state_t *xstate, int src_fd, int dst_fd) xz_result = X_OK; while (1) { if (iobuf.in_pos == iobuf.in_size) { - int rd = safe_read(src_fd, membuf, BUFSIZ); + int rd = safe_read(xstate->src_fd, membuf, BUFSIZ); if (rd < 0) { bb_error_msg(bb_msg_read_error); total = -1; @@ -104,7 +104,7 @@ unpack_xz_stream(transformer_state_t *xstate, int src_fd, int dst_fd) // bb_error_msg("