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sheepdog: remove huge BSS object 

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 <f4bug@amsat.org>
Reviewed-by: Jeff Cody <jcody@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20180523160721.14018-3-pbonzini@redhat.com>
Signed-off-by: Jeff Cody <jcody@redhat.com>
This commit is contained in:
Paolo Bonzini 2018-05-23 18:07:21 +02:00 committed by Jeff Cody
parent 03b036cc0c
commit 68acc99f14
1 changed files with 12 additions and 10 deletions
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22
block/sheepdog.c
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@ -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;