journal/compress: improve xz compression performance

[elogind.git] / src / journal / compress.c

diff --git a/src/journal/compress.c b/src/journal/compress.c
index 49d694ac28273f751f909c3bbf7dfe17bf3eb6e4..93ac92aaadb8ffb9f4615f1d1b86325fd77d9e96 100644 (file)
--- a/src/journal/compress.c
+++ b/src/journal/compress.c
@@ -49,6 +49,13 @@ DEFINE_STRING_TABLE_LOOKUP(object_compressed, int);
 
 int compress_blob_xz(const void *src, uint64_t src_size, void *dst, uint64_t *dst_size) {
 #ifdef HAVE_XZ
+        static const lzma_options_lzma opt = {
+                1u << 20u, NULL, 0, LZMA_LC_DEFAULT, LZMA_LP_DEFAULT,
+                LZMA_PB_DEFAULT, LZMA_MODE_FAST, 128, LZMA_MF_HC3, 4};
+        static const lzma_filter filters[2] = {
+                {LZMA_FILTER_LZMA2, (lzma_options_lzma*) &opt},
+                {LZMA_VLI_UNKNOWN, NULL}
+        };
         lzma_ret ret;
         size_t out_pos = 0;
 
@@ -60,8 +67,11 @@ int compress_blob_xz(const void *src, uint64_t src_size, void *dst, uint64_t *ds
         /* Returns < 0 if we couldn't compress the data or the
          * compressed result is longer than the original */
 
-        ret = lzma_easy_buffer_encode(LZMA_PRESET_DEFAULT, LZMA_CHECK_NONE, NULL,
-                                      src, src_size, dst, &out_pos, src_size - 1);
+        if (src_size < 80)
+                return -ENOBUFS;
+
+        ret = lzma_stream_buffer_encode((lzma_filter*) filters, LZMA_CHECK_NONE, NULL,
+                                        src, src_size, dst, &out_pos, src_size - 1);
         if (ret != LZMA_OK)
                 return -ENOBUFS;