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powerpc/pseries: Add page coalescing support

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Adds support for page coalescing, which is a feature on IBM Power servers
which allows for coalescing identical pages between logical partitions.
Hint text pages as coalesce candidates, since they are the most likely
pages to be able to be coalesced between partitions. This patch also
exports some page coalescing statistics available from firmware via
lparcfg.

[BenH: Moved a couple of things around to fix compile problems]

Signed-off-by: Brian King <brking@linux.vnet.ibm.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
This commit is contained in:
Brian King
2011-05-04 16:01:20 +10:00
committed by Benjamin Herrenschmidt
parent 7707e4110e
commit 9ee820fa00
8 changed files with 106 additions and 30 deletions
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46
arch/powerpc/platforms/pseries/lpar.c
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@@ -329,6 +329,8 @@ static long pSeries_lpar_hpte_insert(unsigned long hpte_group,
/* Make pHyp happy */
if ((rflags & _PAGE_NO_CACHE) & !(rflags & _PAGE_WRITETHRU))
hpte_r &= ~_PAGE_COHERENT;
if (firmware_has_feature(FW_FEATURE_XCMO) && !(hpte_r & HPTE_R_N))
flags |= H_COALESCE_CAND;
lpar_rc = plpar_pte_enter(flags, hpte_group, hpte_v, hpte_r, &slot);
if (unlikely(lpar_rc == H_PTEG_FULL)) {
@@ -771,3 +773,47 @@ out:
local_irq_restore(flags);
}
#endif
/**
* h_get_mpp
* H_GET_MPP hcall returns info in 7 parms
*/
int h_get_mpp(struct hvcall_mpp_data *mpp_data)
{
int rc;
unsigned long retbuf[PLPAR_HCALL9_BUFSIZE];
rc = plpar_hcall9(H_GET_MPP, retbuf);
mpp_data->entitled_mem = retbuf[0];
mpp_data->mapped_mem = retbuf[1];
mpp_data->group_num = (retbuf[2] >> 2 * 8) & 0xffff;
mpp_data->pool_num = retbuf[2] & 0xffff;
mpp_data->mem_weight = (retbuf[3] >> 7 * 8) & 0xff;
mpp_data->unallocated_mem_weight = (retbuf[3] >> 6 * 8) & 0xff;
mpp_data->unallocated_entitlement = retbuf[3] & 0xffffffffffff;
mpp_data->pool_size = retbuf[4];
mpp_data->loan_request = retbuf[5];
mpp_data->backing_mem = retbuf[6];
return rc;
}
EXPORT_SYMBOL(h_get_mpp);
int h_get_mpp_x(struct hvcall_mpp_x_data *mpp_x_data)
{
int rc;
unsigned long retbuf[PLPAR_HCALL9_BUFSIZE] = { 0 };
rc = plpar_hcall9(H_GET_MPP_X, retbuf);
mpp_x_data->coalesced_bytes = retbuf[0];
mpp_x_data->pool_coalesced_bytes = retbuf[1];
mpp_x_data->pool_purr_cycles = retbuf[2];
mpp_x_data->pool_spurr_cycles = retbuf[3];
return rc;
}