From 68acc99f143b60ec4faa2903065b187d4d3c4bf3 Mon Sep 17 00:00:00 2001 From: Paolo Bonzini Date: Wed, 23 May 2018 18:07:21 +0200 Subject: [PATCH] sheepdog: remove huge BSS object MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit block/sheepdog.o has a 4M static variable that is 90% of QEMU's whole .bss section. Replace it with a heap-allocated block, and make it smaller too since only the inode header is actually being used. bss size goes down from 4464280 to 269976. Reviewed-by: Philippe Mathieu-Daudé Reviewed-by: Jeff Cody Signed-off-by: Paolo Bonzini Message-Id: <20180523160721.14018-3-pbonzini@redhat.com> Signed-off-by: Jeff Cody --- block/sheepdog.c | 22 ++++++++++++---------- 1 file changed, 12 insertions(+), 10 deletions(-) diff --git a/block/sheepdog.c b/block/sheepdog.c index cfc0e28aa5..7b98725af7 100644 --- a/block/sheepdog.c +++ b/block/sheepdog.c @@ -2938,13 +2938,14 @@ static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab) QEMUSnapshotInfo *sn_tab = NULL; unsigned wlen, rlen; int found = 0; - static SheepdogInode inode; + SheepdogInode *inode; unsigned long *vdi_inuse; unsigned int start_nr; uint64_t hval; uint32_t vid; vdi_inuse = g_malloc(max); + inode = g_malloc(SD_INODE_HEADER_SIZE); fd = connect_to_sdog(s, &local_err); if (fd < 0) { @@ -2987,7 +2988,7 @@ static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab) } /* we don't need to read entire object */ - ret = read_object(fd, s->bs, (char *)&inode, + ret = read_object(fd, s->bs, (char *)inode, vid_to_vdi_oid(vid), 0, SD_INODE_HEADER_SIZE, 0, s->cache_flags); @@ -2996,17 +2997,17 @@ static int sd_snapshot_list(BlockDriverState *bs, QEMUSnapshotInfo **psn_tab) continue; } - if (!strcmp(inode.name, s->name) && is_snapshot(&inode)) { - sn_tab[found].date_sec = inode.snap_ctime >> 32; - sn_tab[found].date_nsec = inode.snap_ctime & 0xffffffff; - sn_tab[found].vm_state_size = inode.vm_state_size; - sn_tab[found].vm_clock_nsec = inode.vm_clock_nsec; + if (!strcmp(inode->name, s->name) && is_snapshot(inode)) { + sn_tab[found].date_sec = inode->snap_ctime >> 32; + sn_tab[found].date_nsec = inode->snap_ctime & 0xffffffff; + sn_tab[found].vm_state_size = inode->vm_state_size; + sn_tab[found].vm_clock_nsec = inode->vm_clock_nsec; snprintf(sn_tab[found].id_str, sizeof(sn_tab[found].id_str), - "%" PRIu32, inode.snap_id); + "%" PRIu32, inode->snap_id); pstrcpy(sn_tab[found].name, - MIN(sizeof(sn_tab[found].name), sizeof(inode.tag)), - inode.tag); + MIN(sizeof(sn_tab[found].name), sizeof(inode->tag)), + inode->tag); found++; } } @@ -3016,6 +3017,7 @@ out: *psn_tab = sn_tab; g_free(vdi_inuse); + g_free(inode); if (ret < 0) { return ret;