diff options
author | dormando <dormando@rydia.net> | 2018-05-22 18:06:21 -0700 |
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committer | dormando <dormando@rydia.net> | 2018-05-22 19:26:28 -0700 |
commit | 91102e15c86c5ed7010670a58f151734a196cc11 (patch) | |
tree | 78840c57b63d8b2ca033c2071c0f7bd86ab87e3d | |
parent | f939a8468cb4b9a219a1a34cdcef5338a8b84a77 (diff) | |
download | memcached-91102e15c86c5ed7010670a58f151734a196cc11.tar.gz |
alignment and 32bit fixes for extstore
memory alignment when reading header data back.
left "32" in a few places that should've at least been a define, is now
properly an offsetof. used for skipping crc32 for dynamic parts of the item
headers.
-rw-r--r-- | memcached.c | 15 | ||||
-rw-r--r-- | storage.c | 6 | ||||
-rw-r--r-- | storage.h | 3 | ||||
-rwxr-xr-x | t/binary-extstore.t | 7 |
4 files changed, 25 insertions, 6 deletions
diff --git a/memcached.c b/memcached.c index d6dd990..803aa63 100644 --- a/memcached.c +++ b/memcached.c @@ -3584,14 +3584,14 @@ static void _get_extstore_cb(void *e, obj_io *io, int ret) { // item is chunked, crc the iov's if (io->iov != NULL) { // first iov is the header, which we don't use beyond crc - crc2 = crc32c(0, (char *)io->iov[0].iov_base+32, io->iov[0].iov_len-32); + crc2 = crc32c(0, (char *)io->iov[0].iov_base+STORE_OFFSET, io->iov[0].iov_len-STORE_OFFSET); // make sure it's not sent. hack :( io->iov[0].iov_len = 0; for (x = 1; x < io->iovcnt; x++) { crc2 = crc32c(crc2, (char *)io->iov[x].iov_base, io->iov[x].iov_len); } } else { - crc2 = crc32c(0, (char *)read_it+32, io->len-32); + crc2 = crc32c(0, (char *)read_it+STORE_OFFSET, io->len-STORE_OFFSET); } if (crc != crc2) { @@ -3658,7 +3658,12 @@ static void _get_extstore_cb(void *e, obj_io *io, int ret) { // FIXME: This completely breaks UDP support. static inline int _get_extstore(conn *c, item *it, int iovst, int iovcnt) { +#ifdef NEED_ALIGN + item_hdr hdr; + memcpy(&hdr, ITEM_data(it), sizeof(hdr)); +#else item_hdr *hdr = (item_hdr *)ITEM_data(it); +#endif size_t ntotal = ITEM_ntotal(it); unsigned int clsid = slabs_clsid(ntotal); item *new_it; @@ -3746,9 +3751,15 @@ static inline int _get_extstore(conn *c, item *it, int iovst, int iovcnt) { io->io.data = (void *)io; // Now, fill in io->io based on what was in our header. +#ifdef NEED_ALIGN + io->io.page_version = hdr.page_version; + io->io.page_id = hdr.page_id; + io->io.offset = hdr.offset; +#else io->io.page_version = hdr->page_version; io->io.page_id = hdr->page_id; io->io.offset = hdr->offset; +#endif io->io.len = ntotal; io->io.mode = OBJ_IO_READ; io->io.cb = _get_extstore_cb; @@ -81,7 +81,7 @@ int lru_maintainer_store(void *storage, const int clsid) { int copied = 0; // copy original header int hdrtotal = ITEM_ntotal(it) - it->nbytes; - memcpy((char *)io.buf+32, (char *)it+32, hdrtotal - 32); + memcpy((char *)io.buf+STORE_OFFSET, (char *)it+STORE_OFFSET, hdrtotal - STORE_OFFSET); copied = hdrtotal; // copy data in like it were one large object. while (sch && remain) { @@ -93,11 +93,11 @@ int lru_maintainer_store(void *storage, const int clsid) { sch = sch->next; } } else { - memcpy((char *)io.buf+32, (char *)it+32, io.len-32); + memcpy((char *)io.buf+STORE_OFFSET, (char *)it+STORE_OFFSET, io.len-STORE_OFFSET); } // crc what we copied so we can do it sequentially. buf_it->it_flags &= ~ITEM_LINKED; - buf_it->exptime = crc32c(0, (char*)io.buf+32, orig_ntotal-32); + buf_it->exptime = crc32c(0, (char*)io.buf+STORE_OFFSET, orig_ntotal-STORE_OFFSET); extstore_write(storage, &io); item_hdr *hdr = (item_hdr *) ITEM_data(hdr_it); hdr->page_version = io.page_version; @@ -6,4 +6,7 @@ int start_storage_compact_thread(void *arg); void storage_compact_pause(void); void storage_compact_resume(void); +// Ignore pointers and header bits from the CRC +#define STORE_OFFSET offsetof(item, nbytes) + #endif diff --git a/t/binary-extstore.t b/t/binary-extstore.t index 390e26a..5951740 100755 --- a/t/binary-extstore.t +++ b/t/binary-extstore.t @@ -176,7 +176,12 @@ $set->('x', 10, 19, "somevalue"); $set->("mfoo$_", 0, 19, $value); } sleep 4; - $empty->('mfoo1'); + # FIXME: Need to sample through a few values, or fix eviction to be + # more accurate. On 32bit systems some pages unused to this point get + # filled after the first few items, then the eviction algo pulls those + # pages since they have the lowest version number, leaving older objects + # in memory and evicting newer ones. + $empty->('mfoo500'); my %s = $mc->stats(''); cmp_ok($s{extstore_objects_evicted}, '>', 0); |