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r15890@tombo: nickm | 2008-01-12 17:19:51 -0500

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Add a --disable-buffer-freelists configure argument to build without buffer RAM chunk freelists, so we can benchmark the impact of this.


svn:r13121
This commit is contained in:
Nick Mathewson 2008-01-13 00:20:44 +00:00
parent 1b4ef78f6a
commit ae6df065ed
2 changed files with 37 additions and 0 deletions
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7
configure.in
View File

@ -34,13 +34,20 @@ AC_ARG_ENABLE(iphone,
CFLAGS="$CFLAGS -D__DARWIN_UNIX03 -DIPHONE"
fi])
#XXXX020 We should make these enabled or not, before 0.2.0.x-final
AC_ARG_ENABLE(cell-pool,
AS_HELP_STRING(--disable-cell-pool, disable pool allocator for cells))
AC_ARG_ENABLE(buf-freelists,
AS_HELP_STRING(--disable-buf-freelists, disable freelists for buffer RAM))
if test x$enable_cell_pool != xno; then
AC_DEFINE(ENABLE_CELL_POOL, 1,
[Defined if we try to use the pool allocator for queued cells])
fi
if test x$enable_buf_freelists != xno; then
AC_DEFINE(ENABLE_BUF_FREELISTS, 1,
[Defined if we try to use freelists for buffer RAM chunks])
fi
AC_ARG_ENABLE(transparent,
AS_HELP_STRING(--disable-transparent, disable transparent proxy support),

30
src/or/buffers.c
View File

@ -95,6 +95,7 @@ chunk_repack(chunk_t *chunk)
chunk->data = &chunk->mem[0];
}
#ifdef ENABLE_BUF_FREELISTS
/** A freelist of chunks. */
typedef struct chunk_freelist_t {
size_t alloc_size; /**< What size chunks does this freelist hold? */
@ -188,6 +189,24 @@ chunk_new_with_alloc_size(size_t alloc)
ch->data = &ch->mem[0];
return ch;
}
#else
static void
chunk_free(chunk_t *chunk)
{
tor_free(chunk);
}
static INLINE chunk_t *
chunk_new_with_alloc_size(size_t alloc)
{
chunk_t *ch;
ch = tor_malloc_roundup(&alloc);
ch->next = NULL;
ch->datalen = 0;
ch->memlen = CHUNK_SIZE_WITH_ALLOC(alloc);
ch->data = &ch->mem[0];
return ch;
}
#endif
/** Allocate a new chunk with memory size of <b>sz</b>. */
#define chunk_new_with_capacity(sz) \
@ -221,6 +240,7 @@ static INLINE size_t
preferred_chunk_size(size_t target)
{
/* XXXX020 use log2 code, maybe. */
/* XXXX020 or make sizing code more fine-grained! */
size_t sz = MIN_CHUNK_ALLOC;
while (CHUNK_SIZE_WITH_ALLOC(sz) < target) {
sz <<= 1;
@ -233,6 +253,7 @@ preferred_chunk_size(size_t target)
void
buf_shrink_freelists(int free_all)
{
#ifdef ENABLE_BUF_FREELISTS
int i;
for (i = 0; freelists[i].alloc_size; ++i) {
int slack = freelists[i].slack;
@ -267,6 +288,9 @@ buf_shrink_freelists(int free_all)
freelists[i].lowest_length = freelists[i].cur_length;
assert_freelist_ok(&freelists[i]);
}
#else
(void) free_all;
#endif
}
/** Describe the current status of the freelists at log level <b>severity</b>.
@ -274,6 +298,7 @@ buf_shrink_freelists(int free_all)
void
buf_dump_freelist_sizes(int severity)
{
#ifdef ENABLE_BUF_FREELISTS
int i;
log(severity, LD_MM, "====== Buffer freelists:");
for (i = 0; freelists[i].alloc_size; ++i) {
@ -290,6 +315,9 @@ buf_dump_freelist_sizes(int severity)
}
log(severity, LD_MM, U64_FORMAT" allocations in non-freelist sizes",
U64_PRINTF_ARG(n_freelist_miss));
#else
(void)severity;
#endif
}
/** Magic value for buf_t.magic, to catch pointer errors. */
@ -1612,6 +1640,7 @@ assert_buf_ok(buf_t *buf)
}
}
#ifdef ENABLE_BUF_FREELISTS
/** Log an error and exit if <b>fl</b> is corrupted.
*/
static void
@ -1629,4 +1658,5 @@ assert_freelist_ok(chunk_freelist_t *fl)
tor_assert(n >= fl->lowest_length);
tor_assert(n <= fl->max_length);
}
#endif